Using the test case in https://git.kernel.org/torvalds/c/07fa619f2a40c I see sporadic lockdep warnings. This warning on the way into kexec seems to happen every time: [ 67.416890] Freezing user space processes [ 67.419277] Freezing user space processes completed (elapsed 0.001 seconds) [ 67.420754] OOM killer disabled. [ 67.433337] BUG: workqueue leaked atomic, lock or RCU: kworker/u8:7[558] [ 67.433337] preempt=0x00000000 lock=0->2 RCU=0->0 workfn=async_run_entry_fn [ 67.436941] 2 locks held by kworker/u8:7/558: [ 67.437912] #0: ffff893982fdb858 (&q->q_usage_counter(io)){++++}-{0:0}, at: virtblk_freeze+0x28/0x70 [ 67.439980] #1: ffff893982fdb890 (&q->q_usage_counter(queue)){++++}-{0:0}, at: virtblk_freeze+0x28/0x70 [ 67.441783] CPU: 0 UID: 0 PID: 558 Comm: kworker/u8:7 Not tainted 6.13.0-rc1+ #2032 [ 67.442462] Disabling non-boot CPUs ... [ 67.443101] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 67.443106] Workqueue: async async_run_entry_fn [ 67.443114] Call Trace: [ 67.443117] <TASK> [ 67.443123] dump_stack_lvl+0x84/0xd0 [ 67.447325] process_one_work.cold+0x6d/0xc8 [ 67.447991] ? __pfx_async_run_entry_fn+0x10/0x10 [ 67.448644] ? process_one_work+0x24a/0x590 [ 67.449226] worker_thread+0x1c3/0x3b0 [ 67.449757] ? __pfx_worker_thread+0x10/0x10 [ 67.450345] kthread+0xd5/0x100 [ 67.450822] ? __pfx_kthread+0x10/0x10 [ 67.451320] ret_from_fork+0x34/0x50 [ 67.451775] ? __pfx_kthread+0x10/0x10 [ 67.452239] ret_from_fork_asm+0x1a/0x30 [ 67.452747] </TASK> [ 67.471104] smpboot: CPU 1 is now offline This one happens only occasionally (1 in 20 or so): B[ 67.487529] ------------[ cut here ]------------ [ 67.488018] Interrupts enabled after irqrouter_resume+0x0/0x50 [ 67.488684] WARNING: CPU: 0 PID: 571 at drivers/base/syscore.c:103 syscore_resume+0x18a/0x220 [ 67.489571] Modules linked in: [ 67.489920] CPU: 0 UID: 0 PID: 571 Comm: loadret Not tainted 6.13.0-rc1+ #2032 [ 67.490692] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 67.491856] RIP: 0010:syscore_resume+0x18a/0x220 [ 67.492347] Code: 00 e9 21 ff ff ff 80 3d 62 d0 d3 01 00 0f 85 03 ff ff ff 48 8b 73 18 48 c7 c7 06 f6 e9 8d c6 05 4a d0 d3 01 01 e8 16 56 46 ff <0f> 0b e9 e5 fe ff ff e8 ea e9 54 ff 84 c0 0f 85 fb fe ff ff 80 3d [ 67.494253] RSP: 0018:ffffaca540773a08 EFLAGS: 00010286 [ 67.494816] RAX: 0000000000000000 RBX: ffffffff8e9918c0 RCX: 0000000000000027 [ 67.495560] RDX: ffff8939fdc21a88 RSI: 0000000000000001 RDI: ffff8939fdc21a80 [ 67.496324] RBP: 0000000000037e0c R08: 0000000000000000 R09: 0000000000000000 [ 67.497052] R10: 0000000000000001 R11: ffffffff8e782fd8 R12: ffffaca540773a38 [ 67.497788] R13: ffffffff8e68ebe0 R14: 00000000fee1dead R15: 0000000000000000 [ 67.498504] FS: 00007f9ae771f540(0000) GS:ffff8939fdc00000(0000) knlGS:0000000000000000 [ 67.499320] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 67.499930] CR2: 0000559aeea00b70 CR3: 0000000007a5e001 CR4: 0000000000170ef0 [ 67.500650] Call Trace: [ 67.500913] <TASK> [ 67.501147] ? __warn.cold+0xb7/0x151 [ 67.501535] ? syscore_resume+0x18a/0x220 [ 67.501963] ? report_bug+0xff/0x140 [ 67.502331] ? console_unlock+0x9d/0x150 [ 67.502757] ? handle_bug+0x58/0x90 [ 67.503128] ? exc_invalid_op+0x17/0x70 [ 67.503529] ? asm_exc_invalid_op+0x1a/0x20 [ 67.503975] ? syscore_resume+0x18a/0x220 [ 67.504390] ? syscore_resume+0x18a/0x220 [ 67.504814] kernel_kexec+0xf6/0x180 [ 67.505190] __do_sys_reboot+0x206/0x250 [ 67.505653] do_syscall_64+0x95/0x180 [ 67.506037] ? __lock_acquire+0x45f/0x25c0 [ 67.506451] ? lockdep_hardirqs_on_prepare+0xdb/0x190 [ 67.506974] ? smp_call_function_many_cond+0x11c/0x790 [ 67.507503] ? lock_acquire+0xd0/0x310 [ 67.507896] ? free_unref_page+0x22b/0x6a0 [ 67.508316] ? find_held_lock+0x2b/0x80 [ 67.508725] ? free_unref_page+0x510/0x6a0 [ 67.509157] ? do_raw_spin_unlock+0x4d/0xb0 [ 67.509592] ? _raw_spin_unlock+0x23/0x40 [ 67.510006] ? free_unref_page+0x510/0x6a0 [ 67.510428] ? arch_kexec_pre_free_pages+0x1a/0x40 [ 67.510938] ? do_kexec_load+0x11d/0x340 [ 67.511343] ? kfree+0xdb/0x3a0 [ 67.511697] ? __x64_sys_kexec_load+0xa9/0xe0 [ 67.512149] ? kfree+0xdb/0x3a0 [ 67.512485] ? do_kexec_load+0x11d/0x340 [ 67.512912] ? lockdep_hardirqs_on_prepare+0xdb/0x190 [ 67.513430] ? syscall_exit_to_user_mode+0x97/0x290 [ 67.513935] ? do_syscall_64+0xa1/0x180 [ 67.514333] ? find_held_lock+0x2b/0x80 [ 67.514736] ? do_user_addr_fault+0x59f/0x8a0 [ 67.515193] ? do_user_addr_fault+0x5a9/0x8a0 [ 67.515655] ? trace_hardirqs_off+0x4b/0xc0 [ 67.516102] ? lockdep_hardirqs_on_prepare+0xdb/0x190 [ 67.516625] entry_SYSCALL_64_after_hwframe+0x76/0x7e [ 67.517138] RIP: 0033:0x7f9ae765115d [ 67.517515] Code: 00 c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d fb 5c 0c 00 f7 d8 64 89 01 48 [ 67.519312] RSP: 002b:00007ffd17db0ad8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a9 [ 67.520057] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f9ae765115d [ 67.520760] RDX: 0000000045584543 RSI: 0000000028121969 RDI: 00000000fee1dead [ 67.521454] RBP: 00007ffd17db0b20 R08: 0000004d00000000 R09: 0000004d00000000 [ 67.522172] R10: 00007f9ae7745f30 R11: 0000000000000246 R12: 0000000000401070 [ 67.522881] R13: 00007ffd17db0c00 R14: 0000000000000000 R15: 0000000000000000 [ 67.523593] </TASK> [ 67.523832] irq event stamp: 15605 [ 67.524181] hardirqs last enabled at (15613): [<ffffffff8c281b8e>] __up_console_sem+0x7e/0x90 [ 67.525034] hardirqs last disabled at (15620): [<ffffffff8c281b73>] __up_console_sem+0x63/0x90 [ 67.525935] softirqs last enabled at (14732): [<ffffffff8c1c6c12>] __irq_exit_rcu+0xe2/0x100 [ 67.526780] softirqs last disabled at (14717): [<ffffffff8c1c6c12>] __irq_exit_rcu+0xe2/0x100 [ 67.527616] ---[ end trace 0000000000000000 ]--- [ 67.530225] ------------[ cut here ]------------ [ 67.530760] WARNING: CPU: 0 PID: 571 at kernel/time/hrtimer.c:995 hrtimers_resume_local+0x29/0x40 [ 67.531654] Modules linked in: [ 67.531982] CPU: 0 UID: 0 PID: 571 Comm: loadret Tainted: G W 6.13.0-rc1+ #2032 [ 67.532862] Tainted: [W]=WARN [ 67.533185] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 67.534313] RIP: 0010:hrtimers_resume_local+0x29/0x40 [ 67.534833] Code: 90 66 0f 1f 00 0f 1f 44 00 00 8b 05 c5 57 81 02 85 c0 74 18 65 8b 05 0e 8c d4 73 85 c0 75 0d 65 8b 05 c7 88 d4 73 85 c0 74 02 <0f> 0b 31 ff e9 de ee ff ff 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f [ 67.536771] RSP: 0018:ffffaca5407739a0 EFLAGS: 00010202 [ 67.537296] RAX: 0000000000000001 RBX: 0000000fcd31f08b RCX: 00000000000006e0 [ 67.538000] RDX: 0000000000000029 RSI: 00000000007f56f4 RDI: 00000000000006e0 [ 67.538706] RBP: ffffaca5407739f8 R08: 0000000000000001 R09: 0000000000000000 [ 67.539406] R10: 0000000000000001 R11: ffffffff9018d188 R12: 0000000000000202 [ 67.540104] R13: ffffffff8e666ca0 R14: 00000000fee1dead R15: 0000000000000000 [ 67.540840] FS: 00007f9ae771f540(0000) GS:ffff8939fdc00000(0000) knlGS:0000000000000000 [ 67.541638] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 67.542218] CR2: 0000559aeea00b70 CR3: 0000000007a5e001 CR4: 0000000000170ef0 [ 67.542915] Call Trace: [ 67.543185] <TASK> [ 67.543413] ? __warn.cold+0xb7/0x151 [ 67.543804] ? hrtimers_resume_local+0x29/0x40 [ 67.544269] ? report_bug+0xff/0x140 [ 67.544646] ? handle_bug+0x58/0x90 [ 67.544999] ? exc_invalid_op+0x17/0x70 [ 67.545396] ? asm_exc_invalid_op+0x1a/0x20 [ 67.545862] ? hrtimers_resume_local+0x29/0x40 [ 67.546318] timekeeping_resume+0x148/0x190 [ 67.546743] syscore_resume+0x67/0x220 [ 67.547132] kernel_kexec+0xf6/0x180 [ 67.547491] __do_sys_reboot+0x206/0x250 [ 67.547902] do_syscall_64+0x95/0x180 [ 67.548285] ? __lock_acquire+0x45f/0x25c0 [ 67.548714] ? lockdep_hardirqs_on_prepare+0xdb/0x190 [ 67.549255] ? smp_call_function_many_cond+0x11c/0x790 [ 67.549783] ? lock_acquire+0xd0/0x310 [ 67.550176] ? free_unref_page+0x22b/0x6a0 [ 67.550594] ? find_held_lock+0x2b/0x80 [ 67.550973] ? free_unref_page+0x510/0x6a0 [ 67.551409] ? do_raw_spin_unlock+0x4d/0xb0 [ 67.551849] ? _raw_spin_unlock+0x23/0x40 [ 67.552263] ? free_unref_page+0x510/0x6a0 [ 67.552682] ? arch_kexec_pre_free_pages+0x1a/0x40 [ 67.553169] ? do_kexec_load+0x11d/0x340 [ 67.553553] ? kfree+0xdb/0x3a0 [ 67.553895] ? __x64_sys_kexec_load+0xa9/0xe0 [ 67.554345] ? kfree+0xdb/0x3a0 [ 67.554678] ? do_kexec_load+0x11d/0x340 [ 67.555073] ? lockdep_hardirqs_on_prepare+0xdb/0x190 [ 67.555581] ? syscall_exit_to_user_mode+0x97/0x290 [ 67.556121] ? do_syscall_64+0xa1/0x180 [ 67.556506] ? find_held_lock+0x2b/0x80 [ 67.556898] ? do_user_addr_fault+0x59f/0x8a0 [ 67.557347] ? do_user_addr_fault+0x5a9/0x8a0 [ 67.557795] ? trace_hardirqs_off+0x4b/0xc0 [ 67.558221] ? lockdep_hardirqs_on_prepare+0xdb/0x190 [ 67.558721] entry_SYSCALL_64_after_hwframe+0x76/0x7e [ 67.559230] RIP: 0033:0x7f9ae765115d [ 67.559625] Code: 00 c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d fb 5c 0c 00 f7 d8 64 89 01 48 [ 67.561378] RSP: 002b:00007ffd17db0ad8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a9 [ 67.562124] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f9ae765115d [ 67.562815] RDX: 0000000045584543 RSI: 0000000028121969 RDI: 00000000fee1dead [ 67.563507] RBP: 00007ffd17db0b20 R08: 0000004d00000000 R09: 0000004d00000000 [ 67.564223] R10: 00007f9ae7745f30 R11: 0000000000000246 R12: 0000000000401070 [ 67.564912] R13: 00007ffd17db0c00 R14: 0000000000000000 R15: 0000000000000000 [ 67.565614] </TASK> [ 67.565847] irq event stamp: 16351 [ 67.566214] hardirqs last enabled at (16361): [<ffffffff8c281b8e>] __up_console_sem+0x7e/0x90 [ 67.567039] hardirqs last disabled at (16368): [<ffffffff8c281b73>] __up_console_sem+0x63/0x90 [ 67.567867] softirqs last enabled at (16260): [<ffffffff8c1c6c12>] __irq_exit_rcu+0xe2/0x100 [ 67.568702] softirqs last disabled at (16245): [<ffffffff8c1c6c12>] __irq_exit_rcu+0xe2/0x100 [ 67.569516] ---[ end trace 0000000000000000 ]--- [ 67.569981] [ 67.570150] ================================ [ 67.570561] WARNING: inconsistent lock state [ 67.570982] 6.13.0-rc1+ #2032 Tainted: G W [ 67.571501] -------------------------------- [ 67.571922] inconsistent {IN-HARDIRQ-W} -> {HARDIRQ-ON-W} usage. [ 67.572490] loadret/571 [HC0[0]:SC0[0]:HE1:SE1] takes: [ 67.572984] ffff8939fdc267d8 (hrtimer_bases.lock){?.-.}-{2:2}, at: retrigger_next_event+0x38/0xd0 [ 67.573831] {IN-HARDIRQ-W} state was registered at: [ 67.574299] lock_acquire+0xd0/0x310 [ 67.574670] _raw_spin_lock_irqsave+0x48/0x70 [ 67.575102] hrtimer_run_queues+0x4d/0x150 [ 67.575504] update_process_times+0x34/0xf0 [ 67.575926] tick_periodic+0x29/0xe0 [ 67.576287] tick_handle_periodic+0x24/0x70 [ 67.576715] timer_interrupt+0x18/0x30 [ 67.577093] __handle_irq_event_percpu+0x87/0x260 [ 67.577573] handle_irq_event+0x38/0x90 [ 67.577970] handle_level_irq+0x8e/0x160 [ 67.578350] __common_interrupt+0x5c/0x120 [ 67.578763] common_interrupt+0x80/0xa0 [ 67.579144] asm_common_interrupt+0x26/0x40 [ 67.579558] __x86_return_thunk+0x0/0x10 [ 67.579951] _raw_spin_unlock_irqrestore+0x45/0x70 [ 67.580418] __setup_irq+0x34d/0x6a0 [ 67.580787] request_threaded_irq+0x115/0x1b0 [ 67.581214] hpet_time_init+0x31/0x50 [ 67.581577] x86_late_time_init+0x1b/0x40 [ 67.581975] start_kernel+0x998/0xa40 [ 67.582336] x86_64_start_reservations+0x24/0x30 [ 67.582792] x86_64_start_kernel+0xed/0xf0 [ 67.583187] common_startup_64+0x13e/0x141 [ 67.583603] irq event stamp: 16407 [ 67.583934] hardirqs last enabled at (16407): [<ffffffff8c281b8e>] __up_console_sem+0x7e/0x90 [ 67.584742] hardirqs last disabled at (16406): [<ffffffff8c281b73>] __up_console_sem+0x63/0x90 [ 67.585537] softirqs last enabled at (16260): [<ffffffff8c1c6c12>] __irq_exit_rcu+0xe2/0x100 [ 67.586338] softirqs last disabled at (16245): [<ffffffff8c1c6c12>] __irq_exit_rcu+0xe2/0x100 [ 67.587143] [ 67.587143] other info that might help us debug this: [ 67.587759] Possible unsafe locking scenario: [ 67.587759] [ 67.588319] CPU0 [ 67.588564] ---- [ 67.588822] lock(hrtimer_bases.lock); [ 67.589192] <Interrupt> [ 67.589451] lock(hrtimer_bases.lock); [ 67.589843] [ 67.589843] *** DEADLOCK *** [ 67.589843] [ 67.590400] 1 lock held by loadret/571: [ 67.590775] #0: ffffffff8e6902c8 (system_transition_mutex){+.+.}-{4:4}, at: __do_sys_reboot+0xc5/0x250 [ 67.591655] [ 67.591655] stack backtrace: [ 67.592073] CPU: 0 UID: 0 PID: 571 Comm: loadret Tainted: G W 6.13.0-rc1+ #2032 [ 67.592883] Tainted: [W]=WARN [ 67.593176] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 67.594234] Call Trace: [ 67.594480] <TASK> [ 67.594707] dump_stack_lvl+0x84/0xd0 [ 67.595067] print_usage_bug.part.0+0x257/0x340 [ 67.595505] mark_lock+0x735/0x960 [ 67.595849] ? vprintk_emit+0x111/0x460 [ 67.596221] ? hrtimers_resume_local+0x29/0x40 [ 67.596666] ? _printk+0x6c/0x90 [ 67.596986] __lock_acquire+0x7ee/0x25c0 [ 67.597367] ? __warn.cold+0x7f/0x151 [ 67.597728] ? hrtimers_resume_local+0x29/0x40 [ 67.598160] ? nbcon_get_cpu_emergency_nesting+0xa/0x30 [ 67.598671] ? nbcon_cpu_emergency_exit+0xe/0x40 [ 67.599115] ? report_bug+0xff/0x140 [ 67.599462] lock_acquire+0xd0/0x310 [ 67.599815] ? retrigger_next_event+0x38/0xd0 [ 67.600234] _raw_spin_lock+0x30/0x40 [ 67.600603] ? retrigger_next_event+0x38/0xd0 [ 67.601025] retrigger_next_event+0x38/0xd0 [ 67.601425] timekeeping_resume+0x148/0x190 [ 67.601832] syscore_resume+0x67/0x220 [ 67.602193] kernel_kexec+0xf6/0x180 [ 67.602542] __do_sys_reboot+0x206/0x250 [ 67.602934] do_syscall_64+0x95/0x180 [ 67.603292] ? __lock_acquire+0x45f/0x25c0 [ 67.603706] ? lockdep_hardirqs_on_prepare+0xdb/0x190 [ 67.604188] ? smp_call_function_many_cond+0x11c/0x790 [ 67.604684] ? lock_acquire+0xd0/0x310 [ 67.605049] ? free_unref_page+0x22b/0x6a0 [ 67.605444] ? find_held_lock+0x2b/0x80 [ 67.605820] ? free_unref_page+0x510/0x6a0 [ 67.606209] ? do_raw_spin_unlock+0x4d/0xb0 [ 67.606621] ? _raw_spin_unlock+0x23/0x40 [ 67.607008] ? free_unref_page+0x510/0x6a0 [ 67.607406] ? arch_kexec_pre_free_pages+0x1a/0x40 [ 67.607873] ? do_kexec_load+0x11d/0x340 [ 67.608251] ? kfree+0xdb/0x3a0 [ 67.608565] ? __x64_sys_kexec_load+0xa9/0xe0 [ 67.608999] ? kfree+0xdb/0x3a0 [ 67.609314] ? do_kexec_load+0x11d/0x340 [ 67.609699] ? lockdep_hardirqs_on_prepare+0xdb/0x190 [ 67.610179] ? syscall_exit_to_user_mode+0x97/0x290 [ 67.610654] ? do_syscall_64+0xa1/0x180 [ 67.611027] ? find_held_lock+0x2b/0x80 [ 67.611399] ? do_user_addr_fault+0x59f/0x8a0 [ 67.611839] ? do_user_addr_fault+0x5a9/0x8a0 [ 67.612265] ? trace_hardirqs_off+0x4b/0xc0 [ 67.612662] ? lockdep_hardirqs_on_prepare+0xdb/0x190 [ 67.613147] entry_SYSCALL_64_after_hwframe+0x76/0x7e [ 67.613639] RIP: 0033:0x7f9ae765115d [ 67.613988] Code: 00 c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d fb 5c 0c 00 f7 d8 64 89 01 48 [ 67.615719] RSP: 002b:00007ffd17db0ad8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a9 [ 67.616429] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f9ae765115d [ 67.617098] RDX: 0000000045584543 RSI: 0000000028121969 RDI: 00000000fee1dead [ 67.617770] RBP: 00007ffd17db0b20 R08: 0000004d00000000 R09: 0000004d00000000 [ 67.618440] R10: 00007f9ae7745f30 R11: 0000000000000246 R12: 0000000000401070 [ 67.619120] R13: 00007ffd17db0c00 R14: 0000000000000000 R15: 0000000000000000 [ 67.619803] </TASK> [ 67.620127] Enabling non-boot CPUs ... I also saw this one *between* attempts, presumably caused by the virtblk_freeze() one: [ 23.699450] [ 23.699826] ====================================================== [ 23.701054] WARNING: possible circular locking dependency detected [ 23.702409] 6.13.0-rc1+ #2032 Not tainted [ 23.703148] ------------------------------------------------------ [ 23.704248] kworker/u8:4/76 is trying to acquire lock: [ 23.705177] ffff892c811a2d48 ((wq_completion)ext4-rsv-conversion){+.+.}-{0:0}, at: process_one_work+0x51d/0x590 [ 23.706899] [ 23.706899] but task is already holding lock: [ 23.707829] ffff892c82fb5430 (&q->q_usage_counter(io)){++++}-{0:0}, at: virtblk_freeze+0x28/0x70 [ 23.709152] [ 23.709152] which lock already depends on the new lock. [ 23.709152] [ 23.710309] [ 23.710309] the existing dependency chain (in reverse order) is: [ 23.711374] [ 23.711374] -> #3 (&q->q_usage_counter(io)){++++}-{0:0}: [ 23.712380] blk_mq_submit_bio+0x90d/0xb00 [ 23.713006] __submit_bio+0x10d/0x1f0 [ 23.713559] submit_bio_noacct_nocheck+0x324/0x420 [ 23.714266] ext4_bio_write_folio+0x1fc/0x750 [ 23.714851] mpage_submit_folio+0x8d/0xb0 [ 23.715409] mpage_process_page_bufs+0xd0/0x1b0 [ 23.716024] mpage_prepare_extent_to_map+0x1d0/0x510 [ 23.716669] ext4_do_writepages+0x4ec/0xee0 [ 23.717246] ext4_writepages+0xe0/0x280 [ 23.717772] do_writepages+0xeb/0x290 [ 23.718264] filemap_fdatawrite_wbc+0x4f/0x70 [ 23.718830] __filemap_fdatawrite_range+0x60/0x90 [ 23.719440] file_write_and_wait_range+0x47/0xb0 [ 23.720049] ext4_sync_file+0xac/0x3e0 [ 23.720548] do_fsync+0x39/0x70 [ 23.720995] __x64_sys_fsync+0x13/0x20 [ 23.721481] do_syscall_64+0x95/0x180 [ 23.721943] entry_SYSCALL_64_after_hwframe+0x76/0x7e [ 23.722522] [ 23.722522] -> #2 (jbd2_handle){++++}-{0:0}: [ 23.723139] start_this_handle+0x193/0x540 [ 23.723634] jbd2_journal_start_reserved+0x54/0x1e0 [ 23.724210] __ext4_journal_start_reserved+0x7a/0x170 [ 23.724756] ext4_convert_unwritten_io_end_vec+0x2b/0xe0 [ 23.725304] ext4_end_io_rsv_work+0x102/0x1d0 [ 23.725798] process_one_work+0x21f/0x590 [ 23.726255] worker_thread+0x1c3/0x3b0 [ 23.726690] kthread+0xd5/0x100 [ 23.727072] ret_from_fork+0x34/0x50 [ 23.727481] ret_from_fork_asm+0x1a/0x30 [ 23.727939] [ 23.727939] -> #1 ((work_completion)(&ei->i_rsv_conversion_work)){+.+.}-{0:0}: [ 23.728788] process_one_work+0x1f4/0x590 [ 23.729267] worker_thread+0x1c3/0x3b0 [ 23.729715] kthread+0xd5/0x100 [ 23.730100] ret_from_fork+0x34/0x50 [ 23.730502] ret_from_fork_asm+0x1a/0x30 [ 23.730944] [ 23.730944] -> #0 ((wq_completion)ext4-rsv-conversion){+.+.}-{0:0}: [ 23.731688] __lock_acquire+0x14ba/0x25c0 [ 23.732142] lock_acquire+0xd0/0x310 [ 23.732550] process_one_work+0x52e/0x590 [ 23.732995] worker_thread+0x1c3/0x3b0 [ 23.733424] kthread+0xd5/0x100 [ 23.733783] ret_from_fork+0x34/0x50 [ 23.734191] ret_from_fork_asm+0x1a/0x30 [ 23.734632] [ 23.734632] other info that might help us debug this: [ 23.734632] [ 23.735409] Chain exists of: [ 23.735409] (wq_completion)ext4-rsv-conversion --> jbd2_handle --> &q->q_usage_counter(io) [ 23.735409] [ 23.736630] Possible unsafe locking scenario: [ 23.736630] [ 23.737214] CPU0 CPU1 [ 23.737662] ---- ---- [ 23.738124] lock(&q->q_usage_counter(io)); [ 23.738539] lock(jbd2_handle); [ 23.739112] lock(&q->q_usage_counter(io)); [ 23.739770] lock((wq_completion)ext4-rsv-conversion); [ 23.740296] [ 23.740296] *** DEADLOCK *** [ 23.740296] [ 23.740850] 2 locks held by kworker/u8:4/76: [ 23.741284] #0: ffff892c82fb5430 (&q->q_usage_counter(io)){++++}-{0:0}, at: virtblk_freeze+0x28/0x70 [ 23.742172] #1: ffff892c82fb5468 (&q->q_usage_counter(queue)){++++}-{0:0}, at: virtblk_freeze+0x28/0x70 [ 23.743083] [ 23.743083] stack backtrace: [ 23.743514] CPU: 0 UID: 0 PID: 76 Comm: kworker/u8:4 Not tainted 6.13.0-rc1+ #2032 [ 23.744259] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 23.745355] Workqueue: ext4-rsv-conversion ext4_end_io_rsv_work [ 23.745947] Call Trace: [ 23.746207] <TASK> [ 23.746428] dump_stack_lvl+0x84/0xd0 [ 23.746807] print_circular_bug.cold+0x178/0x1be [ 23.747280] check_noncircular+0x148/0x160 [ 23.747694] __lock_acquire+0x14ba/0x25c0 [ 23.748114] lock_acquire+0xd0/0x310 [ 23.748480] ? process_one_work+0x51d/0x590 [ 23.748906] ? mark_held_locks+0x40/0x70 [ 23.749303] process_one_work+0x52e/0x590 [ 23.749705] ? process_one_work+0x51d/0x590 [ 23.750136] worker_thread+0x1c3/0x3b0 [ 23.750503] ? __pfx_worker_thread+0x10/0x10 [ 23.750923] kthread+0xd5/0x100 [ 23.751235] ? __pfx_kthread+0x10/0x10 [ 23.751601] ret_from_fork+0x34/0x50 [ 23.751968] ? __pfx_kthread+0x10/0x10 [ 23.752334] ret_from_fork_asm+0x1a/0x30 [ 23.752721] </TASK> [ 23.753031] BUG: workqueue leaked atomic, lock or RCU: kworker/u8:4[76] [ 23.753031] preempt=0x00000000 lock=2->0 RCU=0->0 workfn=ext4_end_io_rsv_work [ 23.754419] INFO: lockdep is turned off. [ 23.754814] CPU: 0 UID: 0 PID: 76 Comm: kworker/u8:4 Not tainted 6.13.0-rc1+ #2032 [ 23.755537] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 23.756621] Workqueue: ext4-rsv-conversion ext4_end_io_rsv_work [ 23.757214] Call Trace: [ 23.757464] <TASK> [ 23.757682] dump_stack_lvl+0x84/0xd0 [ 23.758060] process_one_work.cold+0x6d/0xc8 [ 23.758481] ? __pfx_ext4_end_io_rsv_work+0x10/0x10 [ 23.758946] ? process_one_work+0x24a/0x590 [ 23.759339] worker_thread+0x1c3/0x3b0 [ 23.759706] ? __pfx_worker_thread+0x10/0x10 [ 23.760276] kthread+0xd5/0x100 [ 23.760581] ? __pfx_kthread+0x10/0x10 [ 23.760956] ret_from_fork+0x34/0x50 [ 23.761306] ? __pfx_kthread+0x10/0x10 [ 23.761669] ret_from_fork_asm+0x1a/0x30 [ 23.762064] </TASK>
Attachment:
smime.p7s
Description: S/MIME cryptographic signature
