rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 1-...!: (1 ticks this GP) idle=7f44/1/0x4000000000000000 softirq=31143/31143 fqs=2
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P8477/1:b..l
(detected by 0, t=10503 jiffies, g=35745, q=168 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 8493 Comm: syz.2.1516 Not tainted 6.1.143-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:mark_lock+0x10/0x320 kernel/locking/lockdep.c:4589
Code: 4c 89 f7 41 89 d9 e9 79 ff ff ff 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 55 41 57 41 56 41 55 41 54 53 50 89 d5 49 89 f6 <48> 89 fb 49 bd 00 00 00 00 00 fc ff df 83 fa 08 75 29 4d 8d 7e 20
RSP: 0018:ffffc900001e0820 EFLAGS: 00000046
RAX: 00000000000c4000 RBX: 0000000000000002 RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffff88807a828b30 RDI: ffff88807a828000
RBP: 0000000000000000 R08: dffffc0000000000 R09: fffffbfff215c24a
R10: fffffbfff215c24a R11: 1ffffffff215c249 R12: ffff88807a828000
R13: 0000000000000002 R14: ffff88807a828b30 R15: ffff88807a828b50
FS: 00007fd88b5276c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000003c80 CR3: 000000001d794000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
mark_usage kernel/locking/lockdep.c:4520 [inline]
__lock_acquire+0xc25/0x7c50 kernel/locking/lockdep.c:5003
lock_acquire+0x1b4/0x490 kernel/locking/lockdep.c:5662
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xa4/0xf0 kernel/locking/spinlock.c:162
debug_object_deactivate+0x63/0x340 lib/debugobjects.c:753
debug_hrtimer_deactivate kernel/time/hrtimer.c:453 [inline]
debug_deactivate+0x29/0x240 kernel/time/hrtimer.c:509
__run_hrtimer kernel/time/hrtimer.c:1720 [inline]
__hrtimer_run_queues+0x2df/0xd60 kernel/time/hrtimer.c:1816
hrtimer_interrupt+0x3c5/0x9c0 kernel/time/hrtimer.c:1878
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1107 [inline]
__sysvec_apic_timer_interrupt+0x153/0x5a0 arch/x86/kernel/apic/apic.c:1124
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1118
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xa5/0x100 kernel/locking/spinlock.c:194
Code: 74 05 e8 3e 5a 65 f7 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f6 44 24 21 02 75 4b f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 26 d5 35 f7 65 8b 05 f7 95 e0 75 85 c0 74 3c 48 c7 04 24 0e 36
RSP: 0018:ffffc90004c3fb80 EFLAGS: 00000206
RAX: 22a402a58eee7000 RBX: 0000000000000a02 RCX: 22a402a58eee7000
RDX: dffffc0000000000 RSI: ffffffff8a8bffe0 RDI: 0000000000000001
RBP: ffffc90004c3fc10 R08: dffffc0000000000 R09: fffffbfff215c249
R10: fffffbfff215c249 R11: 1ffffffff215c248 R12: dffffc0000000000
R13: ffff8880b8e2a580 R14: ffff8880b8e2a580 R15: 1ffff92000987f70
clock_was_set+0x189/0x990 kernel/time/hrtimer.c:996
do_settimeofday64+0x575/0x720 kernel/time/timekeeping.c:1345
__do_sys_clock_settime kernel/time/posix-timers.c:1125 [inline]
__se_sys_clock_settime kernel/time/posix-timers.c:1113 [inline]
__x64_sys_clock_settime+0x223/0x270 kernel/time/posix-timers.c:1113
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fd88a78e929
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fd88b527038 EFLAGS: 00000246 ORIG_RAX: 00000000000000e3
RAX: ffffffffffffffda RBX: 00007fd88a9b5fa0 RCX: 00007fd88a78e929
RDX: 0000000000000000 RSI: 0000200000003c80 RDI: 0000000000000000
RBP: 00007fd88a810b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fd88a9b5fa0 R15: 00007ffe1f4f6578
task:syz.0.1508 state:R running task stack:26176 pid:8477 ppid:4264 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0x10e9/0x40d0 kernel/sched/core.c:6561
preempt_schedule_irq+0xb1/0x150 kernel/sched/core.c:6873
irqentry_exit+0x63/0x70 kernel/entry/common.c:439
asm_common_interrupt+0x22/0x40 arch/x86/include/asm/idtentry.h:682
RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:-1 [inline]
RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:70 [inline]
RIP: 0010:arch_local_irq_save arch/x86/include/asm/irqflags.h:106 [inline]
RIP: 0010:lock_release+0x15d/0x910 kernel/locking/lockdep.c:5678
Code: 83 3b 00 0f 85 4e 04 00 00 4c 89 74 24 08 48 c7 84 24 a0 00 00 00 00 00 00 00 9c 8f 84 24 a0 00 00 00 48 8b 84 24 a0 00 00 00 <48> 89 44 24 50 fa 48 c7 c7 c0 0c 8c 8a e8 c1 69 b4 08 65 ff 05 1a
RSP: 0018:ffffc90003b67620 EFLAGS: 00000246
RAX: 0000000000000246 RBX: ffff88802624641c RCX: 984e39365678e800
RDX: 0000000000000000 RSI: ffffffff8adf1700 RDI: ffffffff8adf16c0
RBP: ffffc90003b67730 R08: dffffc0000000000 R09: fffffbfff1c3ec16
R10: fffffbfff1c3ec16 R11: 1ffffffff1c3ec15 R12: ffff8880773e2054
R13: dffffc0000000000 R14: ffff888026245940 R15: 1ffff9200076ced0
rcu_lock_release include/linux/rcupdate.h:355 [inline]
rcu_read_unlock include/linux/rcupdate.h:824 [inline]
percpu_ref_tryget_many include/linux/percpu-refcount.h:250 [inline]
percpu_ref_tryget+0xfd/0x180 include/linux/percpu-refcount.h:266
css_tryget include/linux/cgroup.h:357 [inline]
get_mem_cgroup_from_mm+0xfe/0x290 mm/memcontrol.c:1041
__mem_cgroup_charge+0x11/0x80 mm/memcontrol.c:6943
mem_cgroup_charge include/linux/memcontrol.h:672 [inline]
shmem_add_to_page_cache+0x8fc/0x1c00 mm/shmem.c:708
shmem_get_folio_gfp+0x158b/0x3400 mm/shmem.c:1971
shmem_get_folio mm/shmem.c:2072 [inline]
shmem_write_begin+0xee/0x3f0 mm/shmem.c:2556
generic_perform_write+0x2db/0x560 mm/filemap.c:3846
__generic_file_write_iter+0x172/0x430 mm/filemap.c:3974
generic_file_write_iter+0xab/0x2e0 mm/filemap.c:4006
call_write_iter include/linux/fs.h:2265 [inline]
new_sync_write fs/read_write.c:491 [inline]
vfs_write+0x44c/0x960 fs/read_write.c:584
ksys_write+0x143/0x240 fs/read_write.c:637
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fd9ef18d3df
RSP: 002b:00007fd9effc4df0 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000001000000 RCX: 00007fd9ef18d3df
RDX: 0000000001000000 RSI: 00007fd9e49f7000 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000005598
R10: 0000000000000002 R11: 0000000000000293 R12: 0000000000000003
R13: 00007fd9effc4ef0 R14: 00007fd9effc4eb0 R15: 00007fd9e49f7000
rcu: rcu_preempt kthread starved for 10495 jiffies! g35745 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
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:R running task stack:26912 pid:16 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0x10e9/0x40d0 kernel/sched/core.c:6561
schedule+0xb9/0x180 kernel/sched/core.c:6637
schedule_timeout+0x15c/0x280 kernel/time/timer.c:1965
rcu_gp_fqs_loop+0x2f2/0x1310 kernel/rcu/tree.c:1706
rcu_gp_kthread+0x95/0x380 kernel/rcu/tree.c:1905
kthread+0x29d/0x330 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 PID: 8496 Comm: syz.4.1517 Not tainted 6.1.143-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:csd_lock_wait kernel/smp.c:424 [inline]
RIP: 0010:smp_call_function_many_cond+0xe7b/0x1270 kernel/smp.c:998
Code: 00 00 00 41 8b 1f 89 de 83 e6 01 31 ff e8 6d e9 0a 00 83 e3 01 48 bb 00 00 00 00 00 fc ff df 75 07 e8 f9 e5 0a 00 eb 37 f3 90 <41> 0f b6 04 1c 84 c0 75 10 41 f7 07 01 00 00 00 74 1e e8 de e5 0a
RSP: 0018:ffffc900038f7540 EFLAGS: 00000246
RAX: ffffffff8175f1a2 RBX: dffffc0000000000 RCX: 0000000000080000
RDX: ffffc9000e8f9000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc900038f76a0 R08: dffffc0000000000 R09: fffffbfff215c270
R10: fffffbfff215c270 R11: 1ffffffff215c26f R12: 1ffff110171e81c1
R13: ffff8880b8e3bb40 R14: 0000000000000001 R15: ffff8880b8f40e08
FS: 00007fd6096136c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f76f4b45000 CR3: 0000000068b2b000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
on_each_cpu_cond_mask+0x3b/0x80 kernel/smp.c:1166
kill_bdev block/bdev.c:75 [inline]
set_blocksize+0x2cd/0x350 block/bdev.c:152
sb_set_blocksize block/bdev.c:161 [inline]
sb_min_blocksize+0xbc/0x180 block/bdev.c:177
hfsplus_read_wrapper+0xc5/0xfd0 fs/hfsplus/wrapper.c:170
hfsplus_fill_super+0x37a/0x1b90 fs/hfsplus/super.c:413
mount_bdev+0x287/0x3c0 fs/super.c:1443
legacy_get_tree+0xe6/0x180 fs/fs_context.c:632
vfs_get_tree+0x88/0x270 fs/super.c:1573
do_new_mount+0x24a/0xa40 fs/namespace.c:3058
do_mount fs/namespace.c:3401 [inline]
__do_sys_mount fs/namespace.c:3609 [inline]
__se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3586
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fd6087900ca
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fd609612e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fd609612ef0 RCX: 00007fd6087900ca
RDX: 0000200000007340 RSI: 0000200000000000 RDI: 00007fd609612eb0
RBP: 0000200000007340 R08: 00007fd609612ef0 R09: 0000000001600008
R10: 0000000001600008 R11: 0000000000000246 R12: 0000200000000000
R13: 00007fd609612eb0 R14: 0000000000000632 R15: 0000200000000080