| CVE |
Vendors |
Products |
Updated |
CVSS v3.1 |
| In the Linux kernel, the following vulnerability has been resolved:
mm: zswap: fix crypto_free_acomp() deadlock in zswap_cpu_comp_dead()
Currently, zswap_cpu_comp_dead() calls crypto_free_acomp() while holding
the per-CPU acomp_ctx mutex. crypto_free_acomp() then holds scomp_lock
(through crypto_exit_scomp_ops_async()).
On the other hand, crypto_alloc_acomp_node() holds the scomp_lock (through
crypto_scomp_init_tfm()), and then allocates memory. If the allocation
results in reclaim, we may attempt to hold the per-CPU acomp_ctx mutex.
The above dependencies can cause an ABBA deadlock. For example in the
following scenario:
(1) Task A running on CPU #1:
crypto_alloc_acomp_node()
Holds scomp_lock
Enters reclaim
Reads per_cpu_ptr(pool->acomp_ctx, 1)
(2) Task A is descheduled
(3) CPU #1 goes offline
zswap_cpu_comp_dead(CPU #1)
Holds per_cpu_ptr(pool->acomp_ctx, 1))
Calls crypto_free_acomp()
Waits for scomp_lock
(4) Task A running on CPU #2:
Waits for per_cpu_ptr(pool->acomp_ctx, 1) // Read on CPU #1
DEADLOCK
Since there is no requirement to call crypto_free_acomp() with the per-CPU
acomp_ctx mutex held in zswap_cpu_comp_dead(), move it after the mutex is
unlocked. Also move the acomp_request_free() and kfree() calls for
consistency and to avoid any potential sublte locking dependencies in the
future.
With this, only setting acomp_ctx fields to NULL occurs with the mutex
held. This is similar to how zswap_cpu_comp_prepare() only initializes
acomp_ctx fields with the mutex held, after performing all allocations
before holding the mutex.
Opportunistically, move the NULL check on acomp_ctx so that it takes place
before the mutex dereference. |
| In the Linux kernel, the following vulnerability has been resolved:
LoongArch: Fix warnings during S3 suspend
The enable_gpe_wakeup() function calls acpi_enable_all_wakeup_gpes(),
and the later one may call the preempt_schedule_common() function,
resulting in a thread switch and causing the CPU to be in an interrupt
enabled state after the enable_gpe_wakeup() function returns, leading
to the warnings as follow.
[ C0] WARNING: ... at kernel/time/timekeeping.c:845 ktime_get+0xbc/0xc8
[ C0] ...
[ C0] Call Trace:
[ C0] [<90000000002243b4>] show_stack+0x64/0x188
[ C0] [<900000000164673c>] dump_stack_lvl+0x60/0x88
[ C0] [<90000000002687e4>] __warn+0x8c/0x148
[ C0] [<90000000015e9978>] report_bug+0x1c0/0x2b0
[ C0] [<90000000016478e4>] do_bp+0x204/0x3b8
[ C0] [<90000000025b1924>] exception_handlers+0x1924/0x10000
[ C0] [<9000000000343bbc>] ktime_get+0xbc/0xc8
[ C0] [<9000000000354c08>] tick_sched_timer+0x30/0xb0
[ C0] [<90000000003408e0>] __hrtimer_run_queues+0x160/0x378
[ C0] [<9000000000341f14>] hrtimer_interrupt+0x144/0x388
[ C0] [<9000000000228348>] constant_timer_interrupt+0x38/0x48
[ C0] [<90000000002feba4>] __handle_irq_event_percpu+0x64/0x1e8
[ C0] [<90000000002fed48>] handle_irq_event_percpu+0x20/0x80
[ C0] [<9000000000306b9c>] handle_percpu_irq+0x5c/0x98
[ C0] [<90000000002fd4a0>] generic_handle_domain_irq+0x30/0x48
[ C0] [<9000000000d0c7b0>] handle_cpu_irq+0x70/0xa8
[ C0] [<9000000001646b30>] handle_loongarch_irq+0x30/0x48
[ C0] [<9000000001646bc8>] do_vint+0x80/0xe0
[ C0] [<90000000002aea1c>] finish_task_switch.isra.0+0x8c/0x2a8
[ C0] [<900000000164e34c>] __schedule+0x314/0xa48
[ C0] [<900000000164ead8>] schedule+0x58/0xf0
[ C0] [<9000000000294a2c>] worker_thread+0x224/0x498
[ C0] [<900000000029d2f0>] kthread+0xf8/0x108
[ C0] [<9000000000221f28>] ret_from_kernel_thread+0xc/0xa4
[ C0]
[ C0] ---[ end trace 0000000000000000 ]---
The root cause is acpi_enable_all_wakeup_gpes() uses a mutex to protect
acpi_hw_enable_all_wakeup_gpes(), and acpi_ut_acquire_mutex() may cause
a thread switch. Since there is no longer concurrent execution during
loongarch_acpi_suspend(), we can call acpi_hw_enable_all_wakeup_gpes()
directly in enable_gpe_wakeup().
The solution is similar to commit 22db06337f590d01 ("ACPI: sleep: Avoid
breaking S3 wakeup due to might_sleep()"). |
| In the Linux kernel, the following vulnerability has been resolved:
block: fix queue freeze vs limits lock order in sysfs store methods
queue_attr_store() always freezes a device queue before calling the
attribute store operation. For attributes that control queue limits, the
store operation will also lock the queue limits with a call to
queue_limits_start_update(). However, some drivers (e.g. SCSI sd) may
need to issue commands to a device to obtain limit values from the
hardware with the queue limits locked. This creates a potential ABBA
deadlock situation if a user attempts to modify a limit (thus freezing
the device queue) while the device driver starts a revalidation of the
device queue limits.
Avoid such deadlock by not freezing the queue before calling the
->store_limit() method in struct queue_sysfs_entry and instead use the
queue_limits_commit_update_frozen helper to freeze the queue after taking
the limits lock.
This also removes taking the sysfs lock for the store_limit method as
it doesn't protect anything here, but creates even more nesting.
Hopefully it will go away from the actual sysfs methods entirely soon.
(commit log adapted from a similar patch from Damien Le Moal) |
| In the Linux kernel, the following vulnerability has been resolved:
block: mark GFP_NOIO around sysfs ->store()
sysfs ->store is called with queue freezed, meantime we have several
->store() callbacks(update_nr_requests, wbt, scheduler) to allocate
memory with GFP_KERNEL which may run into direct reclaim code path,
then potential deadlock can be caused.
Fix the issue by marking NOIO around sysfs ->store() |
| A memory initialization issue was addressed. This issue is fixed in macOS Big Sur 11.0.1, watchOS 7.1, iOS 12.4.9, watchOS 6.2.9, Security Update 2020-006 High Sierra, Security Update 2020-006 Mojave, iOS 14.2 and iPadOS 14.2, watchOS 5.3.9, macOS Catalina 10.15.7 Supplemental Update, macOS Catalina 10.15.7 Update. A malicious application may be able to disclose kernel memory. |
| In the Linux kernel, the following vulnerability has been resolved:
btrfs: fix hang during unmount when block group reclaim task is running
When we start an unmount, at close_ctree(), if we have the reclaim task
running and in the middle of a data block group relocation, we can trigger
a deadlock when stopping an async reclaim task, producing a trace like the
following:
[629724.498185] task:kworker/u16:7 state:D stack: 0 pid:681170 ppid: 2 flags:0x00004000
[629724.499760] Workqueue: events_unbound btrfs_async_reclaim_metadata_space [btrfs]
[629724.501267] Call Trace:
[629724.501759] <TASK>
[629724.502174] __schedule+0x3cb/0xed0
[629724.502842] schedule+0x4e/0xb0
[629724.503447] btrfs_wait_on_delayed_iputs+0x7c/0xc0 [btrfs]
[629724.504534] ? prepare_to_wait_exclusive+0xc0/0xc0
[629724.505442] flush_space+0x423/0x630 [btrfs]
[629724.506296] ? rcu_read_unlock_trace_special+0x20/0x50
[629724.507259] ? lock_release+0x220/0x4a0
[629724.507932] ? btrfs_get_alloc_profile+0xb3/0x290 [btrfs]
[629724.508940] ? do_raw_spin_unlock+0x4b/0xa0
[629724.509688] btrfs_async_reclaim_metadata_space+0x139/0x320 [btrfs]
[629724.510922] process_one_work+0x252/0x5a0
[629724.511694] ? process_one_work+0x5a0/0x5a0
[629724.512508] worker_thread+0x52/0x3b0
[629724.513220] ? process_one_work+0x5a0/0x5a0
[629724.514021] kthread+0xf2/0x120
[629724.514627] ? kthread_complete_and_exit+0x20/0x20
[629724.515526] ret_from_fork+0x22/0x30
[629724.516236] </TASK>
[629724.516694] task:umount state:D stack: 0 pid:719055 ppid:695412 flags:0x00004000
[629724.518269] Call Trace:
[629724.518746] <TASK>
[629724.519160] __schedule+0x3cb/0xed0
[629724.519835] schedule+0x4e/0xb0
[629724.520467] schedule_timeout+0xed/0x130
[629724.521221] ? lock_release+0x220/0x4a0
[629724.521946] ? lock_acquired+0x19c/0x420
[629724.522662] ? trace_hardirqs_on+0x1b/0xe0
[629724.523411] __wait_for_common+0xaf/0x1f0
[629724.524189] ? usleep_range_state+0xb0/0xb0
[629724.524997] __flush_work+0x26d/0x530
[629724.525698] ? flush_workqueue_prep_pwqs+0x140/0x140
[629724.526580] ? lock_acquire+0x1a0/0x310
[629724.527324] __cancel_work_timer+0x137/0x1c0
[629724.528190] close_ctree+0xfd/0x531 [btrfs]
[629724.529000] ? evict_inodes+0x166/0x1c0
[629724.529510] generic_shutdown_super+0x74/0x120
[629724.530103] kill_anon_super+0x14/0x30
[629724.530611] btrfs_kill_super+0x12/0x20 [btrfs]
[629724.531246] deactivate_locked_super+0x31/0xa0
[629724.531817] cleanup_mnt+0x147/0x1c0
[629724.532319] task_work_run+0x5c/0xa0
[629724.532984] exit_to_user_mode_prepare+0x1a6/0x1b0
[629724.533598] syscall_exit_to_user_mode+0x16/0x40
[629724.534200] do_syscall_64+0x48/0x90
[629724.534667] entry_SYSCALL_64_after_hwframe+0x44/0xae
[629724.535318] RIP: 0033:0x7fa2b90437a7
[629724.535804] RSP: 002b:00007ffe0b7e4458 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
[629724.536912] RAX: 0000000000000000 RBX: 00007fa2b9182264 RCX: 00007fa2b90437a7
[629724.538156] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000555d6cf20dd0
[629724.539053] RBP: 0000555d6cf20ba0 R08: 0000000000000000 R09: 00007ffe0b7e3200
[629724.539956] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
[629724.540883] R13: 0000555d6cf20dd0 R14: 0000555d6cf20cb0 R15: 0000000000000000
[629724.541796] </TASK>
This happens because:
1) Before entering close_ctree() we have the async block group reclaim
task running and relocating a data block group;
2) There's an async metadata (or data) space reclaim task running;
3) We enter close_ctree() and park the cleaner kthread;
4) The async space reclaim task is at flush_space() and runs all the
existing delayed iputs;
5) Before the async space reclaim task calls
btrfs_wait_on_delayed_iputs(), the block group reclaim task which is
doing the data block group relocation, creates a delayed iput at
replace_file_extents() (called when COWing leaves that have file extent
items pointing to relocated data exten
---truncated--- |
| A race condition was addressed with improved locking. This issue is fixed in macOS Big Sur 11.2, Security Update 2021-001 Catalina, Security Update 2021-001 Mojave, watchOS 7.3, tvOS 14.4, iOS 14.4 and iPadOS 14.4. A malicious application may be able to elevate privileges. Apple is aware of a report that this issue may have been actively exploited.. |
| XMLUnit for Java before 2.10.0, in the default configuration, might allow code execution via an untrusted stylesheet (used for an XSLT transformation), because XSLT extension functions are enabled. |
| Mercku M6a devices through 2.1.0 allow root TELNET logins via the web admin password. |
| In the Linux kernel, the following vulnerability has been resolved:
RDMA/irdma: Fix sleep from invalid context BUG
Taking the qos_mutex to process RoCEv2 QP's on netdev events causes a
kernel splat.
Fix this by removing the handling for RoCEv2 in
irdma_cm_teardown_connections that uses the mutex. This handling is only
needed for iWARP to avoid having connections established while the link is
down or having connections remain functional after the IP address is
removed.
BUG: sleeping function called from invalid context at kernel/locking/mutex.
Call Trace:
kernel: dump_stack+0x66/0x90
kernel: ___might_sleep.cold.92+0x8d/0x9a
kernel: mutex_lock+0x1c/0x40
kernel: irdma_cm_teardown_connections+0x28e/0x4d0 [irdma]
kernel: ? check_preempt_curr+0x7a/0x90
kernel: ? select_idle_sibling+0x22/0x3c0
kernel: ? select_task_rq_fair+0x94c/0xc90
kernel: ? irdma_exec_cqp_cmd+0xc27/0x17c0 [irdma]
kernel: ? __wake_up_common+0x7a/0x190
kernel: irdma_if_notify+0x3cc/0x450 [irdma]
kernel: ? sched_clock_cpu+0xc/0xb0
kernel: irdma_inet6addr_event+0xc6/0x150 [irdma] |
| In the Linux kernel, the following vulnerability has been resolved:
ixgbe: Add locking to prevent panic when setting sriov_numvfs to zero
It is possible to disable VFs while the PF driver is processing requests
from the VF driver. This can result in a panic.
BUG: unable to handle kernel paging request at 000000000000106c
PGD 0 P4D 0
Oops: 0000 [#1] SMP NOPTI
CPU: 8 PID: 0 Comm: swapper/8 Kdump: loaded Tainted: G I --------- -
Hardware name: Dell Inc. PowerEdge R740/06WXJT, BIOS 2.8.2 08/27/2020
RIP: 0010:ixgbe_msg_task+0x4c8/0x1690 [ixgbe]
Code: 00 00 48 8d 04 40 48 c1 e0 05 89 7c 24 24 89 fd 48 89 44 24 10 83 ff
01 0f 84 b8 04 00 00 4c 8b 64 24 10 4d 03 a5 48 22 00 00 <41> 80 7c 24 4c
00 0f 84 8a 03 00 00 0f b7 c7 83 f8 08 0f 84 8f 0a
RSP: 0018:ffffb337869f8df8 EFLAGS: 00010002
RAX: 0000000000001020 RBX: 0000000000000000 RCX: 000000000000002b
RDX: 0000000000000002 RSI: 0000000000000008 RDI: 0000000000000006
RBP: 0000000000000006 R08: 0000000000000002 R09: 0000000000029780
R10: 00006957d8f42832 R11: 0000000000000000 R12: 0000000000001020
R13: ffff8a00e8978ac0 R14: 000000000000002b R15: ffff8a00e8979c80
FS: 0000000000000000(0000) GS:ffff8a07dfd00000(0000) knlGS:00000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000000106c CR3: 0000000063e10004 CR4: 00000000007726e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
PKRU: 55555554
Call Trace:
<IRQ>
? ttwu_do_wakeup+0x19/0x140
? try_to_wake_up+0x1cd/0x550
? ixgbevf_update_xcast_mode+0x71/0xc0 [ixgbevf]
ixgbe_msix_other+0x17e/0x310 [ixgbe]
__handle_irq_event_percpu+0x40/0x180
handle_irq_event_percpu+0x30/0x80
handle_irq_event+0x36/0x53
handle_edge_irq+0x82/0x190
handle_irq+0x1c/0x30
do_IRQ+0x49/0xd0
common_interrupt+0xf/0xf
This can be eventually be reproduced with the following script:
while :
do
echo 63 > /sys/class/net/<devname>/device/sriov_numvfs
sleep 1
echo 0 > /sys/class/net/<devname>/device/sriov_numvfs
sleep 1
done
Add lock when disabling SR-IOV to prevent process VF mailbox communication. |
| The strncmp implementation optimized for the Power10 processor in the GNU C Library version 2.40 and later writes to vector registers v20 to v31 without saving contents from the caller (those registers are defined as non-volatile registers by the powerpc64le ABI), resulting in overwriting of its contents and potentially altering control flow of the caller, or leaking the input strings to the function to other parts of the program. |
| Mozilla Firefox before 21.0, Firefox ESR 17.x before 17.0.6, Thunderbird before 17.0.6, and Thunderbird ESR 17.x before 17.0.6 do not properly initialize data structures for the nsDOMSVGZoomEvent::mPreviousScale and nsDOMSVGZoomEvent::mNewScale functions, which allows remote attackers to obtain sensitive information from process memory via a crafted web site. |
| Software installed and running inside a Guest VM may override Firmware's state and gain access to the GPU. |
| In the Linux kernel, the following vulnerability has been resolved:
net: bcmgenet: Use stronger register read/writes to assure ordering
GCC12 appears to be much smarter about its dependency tracking and is
aware that the relaxed variants are just normal loads and stores and
this is causing problems like:
[ 210.074549] ------------[ cut here ]------------
[ 210.079223] NETDEV WATCHDOG: enabcm6e4ei0 (bcmgenet): transmit queue 1 timed out
[ 210.086717] WARNING: CPU: 1 PID: 0 at net/sched/sch_generic.c:529 dev_watchdog+0x234/0x240
[ 210.095044] Modules linked in: genet(E) nft_fib_inet nft_fib_ipv4 nft_fib_ipv6 nft_fib nft_reject_inet nf_reject_ipv4 nf_reject_ipv6 nft_reject nft_ct nft_chain_nat]
[ 210.146561] ACPI CPPC: PCC check channel failed for ss: 0. ret=-110
[ 210.146927] CPU: 1 PID: 0 Comm: swapper/1 Tainted: G E 5.17.0-rc7G12+ #58
[ 210.153226] CPPC Cpufreq:cppc_scale_freq_workfn: failed to read perf counters
[ 210.161349] Hardware name: Raspberry Pi Foundation Raspberry Pi 4 Model B/Raspberry Pi 4 Model B, BIOS EDK2-DEV 02/08/2022
[ 210.161353] pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
[ 210.161358] pc : dev_watchdog+0x234/0x240
[ 210.161364] lr : dev_watchdog+0x234/0x240
[ 210.161368] sp : ffff8000080a3a40
[ 210.161370] x29: ffff8000080a3a40 x28: ffffcd425af87000 x27: ffff8000080a3b20
[ 210.205150] x26: ffffcd425aa00000 x25: 0000000000000001 x24: ffffcd425af8ec08
[ 210.212321] x23: 0000000000000100 x22: ffffcd425af87000 x21: ffff55b142688000
[ 210.219491] x20: 0000000000000001 x19: ffff55b1426884c8 x18: ffffffffffffffff
[ 210.226661] x17: 64656d6974203120 x16: 0000000000000001 x15: 6d736e617274203a
[ 210.233831] x14: 2974656e65676d63 x13: ffffcd4259c300d8 x12: ffffcd425b07d5f0
[ 210.241001] x11: 00000000ffffffff x10: ffffcd425b07d5f0 x9 : ffffcd4258bdad9c
[ 210.248171] x8 : 00000000ffffdfff x7 : 000000000000003f x6 : 0000000000000000
[ 210.255341] x5 : 0000000000000000 x4 : 0000000000000000 x3 : 0000000000001000
[ 210.262511] x2 : 0000000000001000 x1 : 0000000000000005 x0 : 0000000000000044
[ 210.269682] Call trace:
[ 210.272133] dev_watchdog+0x234/0x240
[ 210.275811] call_timer_fn+0x3c/0x15c
[ 210.279489] __run_timers.part.0+0x288/0x310
[ 210.283777] run_timer_softirq+0x48/0x80
[ 210.287716] __do_softirq+0x128/0x360
[ 210.291392] __irq_exit_rcu+0x138/0x140
[ 210.295243] irq_exit_rcu+0x1c/0x30
[ 210.298745] el1_interrupt+0x38/0x54
[ 210.302334] el1h_64_irq_handler+0x18/0x24
[ 210.306445] el1h_64_irq+0x7c/0x80
[ 210.309857] arch_cpu_idle+0x18/0x2c
[ 210.313445] default_idle_call+0x4c/0x140
[ 210.317470] cpuidle_idle_call+0x14c/0x1a0
[ 210.321584] do_idle+0xb0/0x100
[ 210.324737] cpu_startup_entry+0x30/0x8c
[ 210.328675] secondary_start_kernel+0xe4/0x110
[ 210.333138] __secondary_switched+0x94/0x98
The assumption when these were relaxed seems to be that device memory
would be mapped non reordering, and that other constructs
(spinlocks/etc) would provide the barriers to assure that packet data
and in memory rings/queues were ordered with respect to device
register reads/writes. This itself seems a bit sketchy, but the real
problem with GCC12 is that it is moving the actual reads/writes around
at will as though they were independent operations when in truth they
are not, but the compiler can't know that. When looking at the
assembly dumps for many of these routines its possible to see very
clean, but not strictly in program order operations occurring as the
compiler would be free to do if these weren't actually register
reads/write operations.
Its possible to suppress the timeout with a liberal bit of dma_mb()'s
sprinkled around but the device still seems unable to reliably
send/receive data. A better plan is to use the safer readl/writel
everywhere.
Since this partially reverts an older commit, which notes the use of
the relaxed variants for performance reasons. I would suggest that
any performance problems
---truncated--- |
| In the Linux kernel, the following vulnerability has been resolved:
bpf: Add BPF_PROG_TYPE_CGROUP_SKB attach type enforcement in BPF_LINK_CREATE
bpf_prog_attach uses attach_type_to_prog_type to enforce proper
attach type for BPF_PROG_TYPE_CGROUP_SKB. link_create uses
bpf_prog_get and relies on bpf_prog_attach_check_attach_type
to properly verify prog_type <> attach_type association.
Add missing attach_type enforcement for the link_create case.
Otherwise, it's currently possible to attach cgroup_skb prog
types to other cgroup hooks. |
| In SonarQube before 25.6, 2025.3 Commercial, and 2025.1.3 LTA, authenticated low-privileged users can query the /api/v2/users-management/users endpoint and obtain user fields intended for administrators only, including the email addresses of other accounts. |
| In the Linux kernel, the following vulnerability has been resolved:
scsi: mpi3mr: Fix corrupt config pages PHY state is switched in sysfs
The driver, through the SAS transport, exposes a sysfs interface to
enable/disable PHYs in a controller/expander setup. When multiple PHYs
are disabled and enabled in rapid succession, the persistent and current
config pages related to SAS IO unit/SAS Expander pages could get
corrupted.
Use separate memory for each config request. |
| In the Linux kernel, the following vulnerability has been resolved:
netfilter: nf_tables: don't skip expired elements during walk
There is an asymmetry between commit/abort and preparation phase if the
following conditions are met:
1. set is a verdict map ("1.2.3.4 : jump foo")
2. timeouts are enabled
In this case, following sequence is problematic:
1. element E in set S refers to chain C
2. userspace requests removal of set S
3. kernel does a set walk to decrement chain->use count for all elements
from preparation phase
4. kernel does another set walk to remove elements from the commit phase
(or another walk to do a chain->use increment for all elements from
abort phase)
If E has already expired in 1), it will be ignored during list walk, so its use count
won't have been changed.
Then, when set is culled, ->destroy callback will zap the element via
nf_tables_set_elem_destroy(), but this function is only safe for
elements that have been deactivated earlier from the preparation phase:
lack of earlier deactivate removes the element but leaks the chain use
count, which results in a WARN splat when the chain gets removed later,
plus a leak of the nft_chain structure.
Update pipapo_get() not to skip expired elements, otherwise flush
command reports bogus ENOENT errors. |
| In the Linux kernel, the following vulnerability has been resolved:
btrfs: zoned: traverse devices under chunk_mutex in btrfs_can_activate_zone
btrfs_can_activate_zone() can be called with the device_list_mutex already
held, which will lead to a deadlock:
insert_dev_extents() // Takes device_list_mutex
`-> insert_dev_extent()
`-> btrfs_insert_empty_item()
`-> btrfs_insert_empty_items()
`-> btrfs_search_slot()
`-> btrfs_cow_block()
`-> __btrfs_cow_block()
`-> btrfs_alloc_tree_block()
`-> btrfs_reserve_extent()
`-> find_free_extent()
`-> find_free_extent_update_loop()
`-> can_allocate_chunk()
`-> btrfs_can_activate_zone() // Takes device_list_mutex again
Instead of using the RCU on fs_devices->device_list we
can use fs_devices->alloc_list, protected by the chunk_mutex to traverse
the list of active devices.
We are in the chunk allocation thread. The newer chunk allocation
happens from the devices in the fs_device->alloc_list protected by the
chunk_mutex.
btrfs_create_chunk()
lockdep_assert_held(&info->chunk_mutex);
gather_device_info
list_for_each_entry(device, &fs_devices->alloc_list, dev_alloc_list)
Also, a device that reappears after the mount won't join the alloc_list
yet and, it will be in the dev_list, which we don't want to consider in
the context of the chunk alloc.
[15.166572] WARNING: possible recursive locking detected
[15.167117] 5.17.0-rc6-dennis #79 Not tainted
[15.167487] --------------------------------------------
[15.167733] kworker/u8:3/146 is trying to acquire lock:
[15.167733] ffff888102962ee0 (&fs_devs->device_list_mutex){+.+.}-{3:3}, at: find_free_extent+0x15a/0x14f0 [btrfs]
[15.167733]
[15.167733] but task is already holding lock:
[15.167733] ffff888102962ee0 (&fs_devs->device_list_mutex){+.+.}-{3:3}, at: btrfs_create_pending_block_groups+0x20a/0x560 [btrfs]
[15.167733]
[15.167733] other info that might help us debug this:
[15.167733] Possible unsafe locking scenario:
[15.167733]
[15.171834] CPU0
[15.171834] ----
[15.171834] lock(&fs_devs->device_list_mutex);
[15.171834] lock(&fs_devs->device_list_mutex);
[15.171834]
[15.171834] *** DEADLOCK ***
[15.171834]
[15.171834] May be due to missing lock nesting notation
[15.171834]
[15.171834] 5 locks held by kworker/u8:3/146:
[15.171834] #0: ffff888100050938 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x1c3/0x5a0
[15.171834] #1: ffffc9000067be80 ((work_completion)(&fs_info->async_data_reclaim_work)){+.+.}-{0:0}, at: process_one_work+0x1c3/0x5a0
[15.176244] #2: ffff88810521e620 (sb_internal){.+.+}-{0:0}, at: flush_space+0x335/0x600 [btrfs]
[15.176244] #3: ffff888102962ee0 (&fs_devs->device_list_mutex){+.+.}-{3:3}, at: btrfs_create_pending_block_groups+0x20a/0x560 [btrfs]
[15.176244] #4: ffff8881152e4b78 (btrfs-dev-00){++++}-{3:3}, at: __btrfs_tree_lock+0x27/0x130 [btrfs]
[15.179641]
[15.179641] stack backtrace:
[15.179641] CPU: 1 PID: 146 Comm: kworker/u8:3 Not tainted 5.17.0-rc6-dennis #79
[15.179641] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1.fc35 04/01/2014
[15.179641] Workqueue: events_unbound btrfs_async_reclaim_data_space [btrfs]
[15.179641] Call Trace:
[15.179641] <TASK>
[15.179641] dump_stack_lvl+0x45/0x59
[15.179641] __lock_acquire.cold+0x217/0x2b2
[15.179641] lock_acquire+0xbf/0x2b0
[15.183838] ? find_free_extent+0x15a/0x14f0 [btrfs]
[15.183838] __mutex_lock+0x8e/0x970
[15.183838] ? find_free_extent+0x15a/0x14f0 [btrfs]
[15.183838] ? find_free_extent+0x15a/0x14f0 [btrfs]
[15.183838] ? lock_is_held_type+0xd7/0x130
[15.183838] ? find_free_extent+0x15a/0x14f0 [btrfs]
[15.183838] find_free_extent+0x15a/0x14f0 [btrfs]
[15.183838] ? _raw_spin_unlock+0x24/0x40
[15.183838] ? btrfs_get_alloc_profile+0x106/0x230 [btrfs]
[15.187601] btrfs_reserve_extent+0x131/0x260 [btrfs]
[15.
---truncated--- |
