rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P31360/1:b..l
rcu: (detected by 0, t=10502 jiffies, g=229629, q=422 ncpus=2)
task:syz-executor state:R running task stack:22472 pid:31360 tgid:31360 ppid:31353 task_flags:0x400140 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5295 [inline]
__schedule+0x157c/0x52b0 kernel/sched/core.c:6907
preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7234
irqentry_exit+0x599/0x620 kernel/entry/common.c:239
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:lock_acquire+0x221/0x330 kernel/locking/lockdep.c:5872
Code: ff ff ff e8 d1 8a ff 09 f7 44 24 08 00 02 00 00 0f 84 3a ff ff ff 65 48 8b 05 4b 98 77 11 48 3b 44 24 58 75 33 fb 48 83 c4 60 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 48 8d 3d 08 e0 73
RSP: 0018:ffffc90003367898 EFLAGS: 00000282
RAX: a23e880c2571c000 RBX: 0000000000000000 RCX: 0000000000000046
RDX: 00000000d073fed0 RSI: ffffffff8e15ba22 RDI: ffffffff8c279900
RBP: ffffffff81759295 R08: ffffffff81759295 R09: ffffffff8e75e3e0
R10: ffffc900033679f8 R11: ffffffff81af8200 R12: 0000000000000002
R13: ffffffff8e75e3e0 R14: 0000000000000000 R15: 0000000000000246
rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
rcu_read_lock include/linux/rcupdate.h:850 [inline]
class_rcu_constructor include/linux/rcupdate.h:1193 [inline]
unwind_next_frame+0xc2/0x23c0 arch/x86/kernel/unwind_orc.c:495
arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
save_stack+0x122/0x230 mm/page_owner.c:165
__reset_page_owner+0x71/0x1f0 mm/page_owner.c:320
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1432 [inline]
__free_frozen_pages+0xc01/0xd80 mm/page_alloc.c:2972
__slab_free+0x263/0x2b0 mm/slub.c:5490
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x97/0x100 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:350
kasan_slab_alloc include/linux/kasan.h:253 [inline]
slab_post_alloc_hook mm/slub.c:4459 [inline]
slab_alloc_node mm/slub.c:4788 [inline]
kmem_cache_alloc_noprof+0x2bc/0x650 mm/slub.c:4795
alloc_filename fs/namei.c:142 [inline]
do_getname+0x2e/0x250 fs/namei.c:182
getname_flags fs/namei.c:225 [inline]
getname include/linux/fs.h:2512 [inline]
class_filename_constructor include/linux/fs.h:2539 [inline]
__do_sys_unlink fs/namei.c:5574 [inline]
__se_sys_unlink+0x1e/0x140 fs/namei.c:5572
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa73a99b067
RSP: 002b:00007fa73ad3ecb8 EFLAGS: 00000206 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fa73a99b067
RDX: 00007fa73ad3ece0 RSI: 00007fa73ad3ed70 RDI: 00007fa73ad3ed70
RBP: 00007fa73ad3ed70 R08: 00007fa73ad3fd70 R09: 00000000ffffffff
R10: 0000000000000100 R11: 0000000000000206 R12: 00007fa73ad3fe00
R13: 00007fa73aa31c3b R14: 000000000013c54d R15: 00007fa73ad3fe40
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g229629 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=1 timer-softirq=89153
rcu: rcu_preempt kthread starved for 10502 jiffies! g229629 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1
rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt state:I stack:27576 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5295 [inline]
__schedule+0x157c/0x52b0 kernel/sched/core.c:6907
__schedule_loop kernel/sched/core.c:6989 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7004
schedule_timeout+0x158/0x2c0 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x312/0x11d0 kernel/rcu/tree.c:2095
rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2297
kthread+0x388/0x470 kernel/kthread.c:467
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 3344 Comm: syz.5.9146 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
RIP: 0010:num_possible_cpus include/linux/cpumask.h:1222 [inline]
RIP: 0010:mm_get_cid kernel/sched/sched.h:3839 [inline]
RIP: 0010:sched_mm_cid_fork+0x56c/0xc80 kernel/sched/core.c:10704
Code: 00 00 0f b6 c0 41 29 c6 4c 89 e3 e9 64 ff ff ff 49 c7 c5 d8 24 1a 8e 49 c1 ed 03 eb 0b 44 89 e0 f7 d8 0f 81 2a fd ff ff f3 90 <48> b8 00 00 00 00 00 fc ff df 41 0f b6 44 05 00 84 c0 75 50 44 8b
RSP: 0018:ffffc9000d99fc78 EFLAGS: 00000887
RAX: 0000000080000000 RBX: 0000000000000002 RCX: dffffc0000000000
RDX: dffffc0000000000 RSI: 0000000000000002 RDI: ffff88802a7d48d0
RBP: ffff88802a7d48d0 R08: 1ffff110054fa7c9 R09: 0000000000000000
R10: ffff88802a7d3f8c R11: fffff52001b33f80 R12: 0000000080000000
R13: 1ffffffff1c3449b R14: 0000000000000002 R15: ffff88802a7d3d40
FS: 00007fe5311216c0(0000) GS:ffff8881255a0000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055558aaf8a28 CR3: 0000000041c0e000 CR4: 00000000003526f0
Call Trace:
bprm_execve+0xda1/0x1410 fs/exec.c:1771
do_execveat_common+0x50d/0x690 fs/exec.c:1846
__do_sys_execveat fs/exec.c:1941 [inline]
__se_sys_execveat fs/exec.c:1934 [inline]
__x64_sys_execveat+0xc7/0xf0 fs/exec.c:1934
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe53019bf79
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 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 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fe531121028 EFLAGS: 00000246 ORIG_RAX: 0000000000000142
RAX: ffffffffffffffda RBX: 00007fe530415fa0 RCX: 00007fe53019bf79
RDX: 0000000000000000 RSI: 0000200000000000 RDI: 0000000000000004
RBP: 00007fe5302327e0 R08: 0000000000001000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe530416038 R14: 00007fe530415fa0 R15: 00007fe53053fa48
watchdog: BUG: soft lockup - CPU#0 stuck for 246s! [syz.7.9147:3356]
Modules linked in:
irq event stamp: 1372796
hardirqs last enabled at (1372795): [] irqentry_exit+0x59e/0x620 kernel/entry/common.c:242
hardirqs last disabled at (1372796): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056
softirqs last enabled at (1372794): [] __do_softirq kernel/softirq.c:656 [inline]
softirqs last enabled at (1372794): [] invoke_softirq kernel/softirq.c:496 [inline]
softirqs last enabled at (1372794): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723
softirqs last disabled at (1372773): [] __do_softirq kernel/softirq.c:656 [inline]
softirqs last disabled at (1372773): [] invoke_softirq kernel/softirq.c:496 [inline]
softirqs last disabled at (1372773): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723
CPU: 0 UID: 0 PID: 3356 Comm: syz.7.9147 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline]
RIP: 0010:smp_call_function_many_cond+0xce5/0x1270 kernel/smp.c:877
Code: 45 8b 2c 24 44 89 ee 83 e6 01 31 ff e8 24 da 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 cf d5 0b 00 eb 38 f3 90 <42> 0f b6 04 2b 84 c0 75 11 41 f7 04 24 01 00 00 00 74 1e e8 b3 d5
RSP: 0018:ffffc9000d926660 EFLAGS: 00000246
RAX: ffffffff81b86d6d RBX: 1ffff110170e80ed RCX: 0000000000080000
RDX: ffffc900109db000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc9000d9267a0 R08: ffffffff9010fb77 R09: 1ffffffff2021f6e
R10: dffffc0000000000 R11: fffffbfff2021f6f R12: ffff8880b8740768
R13: dffffc0000000000 R14: ffff8880b863bd80 R15: 0000000000000001
FS: 00007fce3b39d6c0(0000) GS:ffff8881254a0000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c30211b CR3: 000000006226e000 CR4: 00000000003526f0
Call Trace:
on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1043
__flush_tlb_multi arch/x86/include/asm/paravirt.h:57 [inline]
flush_tlb_multi arch/x86/mm/tlb.c:1382 [inline]
arch_tlbbatch_flush+0x287/0x480 arch/x86/mm/tlb.c:1746
try_to_unmap_flush+0x50/0xd0 mm/rmap.c:711
shrink_folio_list+0x4928/0x5160 mm/vmscan.c:1600
reclaim_folio_list+0x100/0x400 mm/vmscan.c:2196
reclaim_pages+0x45b/0x530 mm/vmscan.c:2233
madvise_cold_or_pageout_pte_range+0x1e2d/0x2220 mm/madvise.c:561
walk_pmd_range mm/pagewalk.c:130 [inline]
walk_pud_range mm/pagewalk.c:224 [inline]
walk_p4d_range mm/pagewalk.c:262 [inline]
walk_pgd_range+0x1032/0x1d30 mm/pagewalk.c:303
__walk_page_range+0x14c/0x710 mm/pagewalk.c:411
walk_page_range_vma_unsafe+0x309/0x410 mm/pagewalk.c:715
madvise_pageout_page_range mm/madvise.c:620 [inline]
madvise_pageout mm/madvise.c:645 [inline]
madvise_vma_behavior+0x2850/0x4300 mm/madvise.c:1364
madvise_walk_vmas+0x573/0xae0 mm/madvise.c:1719
madvise_do_behavior+0x386/0x540 mm/madvise.c:1935
do_madvise+0x1fa/0x2e0 mm/madvise.c:2028
__do_sys_madvise mm/madvise.c:2037 [inline]
__se_sys_madvise mm/madvise.c:2035 [inline]
__x64_sys_madvise+0xa6/0xc0 mm/madvise.c:2035
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fce3a59bf79
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 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 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fce3b39d028 EFLAGS: 00000246 ORIG_RAX: 000000000000001c
RAX: ffffffffffffffda RBX: 00007fce3a816270 RCX: 00007fce3a59bf79
RDX: 0000000000000015 RSI: 0000000000600000 RDI: 0000200000000000
RBP: 00007fce3a6327e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fce3a816308 R14: 00007fce3a816270 R15: 00007fce3a93fa48
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 3344 Comm: syz.5.9146 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
RIP: 0010:_find_first_zero_bit+0x52/0xb0 lib/find_bit.c:149
Code: 03 42 80 3c 20 00 74 08 4c 89 f7 e8 38 d7 88 fd 49 8b 06 48 83 f8 ff 74 2b 45 31 ed 48 f7 d0 f3 48 0f bc c0 4c 01 e8 48 39 d8 <48> 0f 43 c3 eb 05 31 db 48 89 d8 5b 41 5c 41 5d 41 5e 41 5f e9 45
RSP: 0018:ffffc9000d99fc48 EFLAGS: 00000046
RAX: 0000000000000002 RBX: 0000000000000002 RCX: dffffc0000000000
RDX: dffffc0000000000 RSI: 0000000000000002 RDI: ffff88802a7d48d0
RBP: ffff88802a7d48d0 R08: 1ffff110054fa7c9 R09: 0000000000000000
R10: ffff88802a7d3f8c R11: fffff52001b33f80 R12: dffffc0000000000
R13: 0000000000000000 R14: ffff88802a7d48d0 R15: ffff88802a7d3d40
FS: 00007fe5311216c0(0000) GS:ffff8881255a0000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055558aaf8a28 CR3: 0000000041c0e000 CR4: 00000000003526f0
Call Trace:
find_first_zero_bit include/linux/find.h:393 [inline]
__mm_get_cid kernel/sched/sched.h:3824 [inline]
mm_get_cid kernel/sched/sched.h:3839 [inline]
sched_mm_cid_fork+0x592/0xc80 kernel/sched/core.c:10704
bprm_execve+0xda1/0x1410 fs/exec.c:1771
do_execveat_common+0x50d/0x690 fs/exec.c:1846
__do_sys_execveat fs/exec.c:1941 [inline]
__se_sys_execveat fs/exec.c:1934 [inline]
__x64_sys_execveat+0xc7/0xf0 fs/exec.c:1934
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe53019bf79
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 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 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fe531121028 EFLAGS: 00000246 ORIG_RAX: 0000000000000142
RAX: ffffffffffffffda RBX: 00007fe530415fa0 RCX: 00007fe53019bf79
RDX: 0000000000000000 RSI: 0000200000000000 RDI: 0000000000000004
RBP: 00007fe5302327e0 R08: 0000000000001000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe530416038 R14: 00007fe530415fa0 R15: 00007fe53053fa48