rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P10593/1:b..l P5097/1:b..l P5894/1:b..l
rcu: (detected by 1, t=10502 jiffies, g=63825, q=114 ncpus=2)
task:syz-executor state:R running task stack:23520 pid:5894 tgid:5894 ppid:5852 flags:0x00000000
Call Trace:
context_switch kernel/sched/core.c:5408 [inline]
__schedule+0xf15/0x5d00 kernel/sched/core.c:6745
preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7067
irqentry_exit+0x36/0x90 kernel/entry/common.c:354
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:inode_permission+0x38/0x5f0 fs/namei.c:508
Code: fc 55 89 d5 53 48 89 f3 4c 8d 73 28 48 83 ec 10 e8 dd 64 91 ff 4c 89 f2 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 <0f> 85 3f 05 00 00 41 89 ed 31 ff 4c 8b 7b 28 41 83 e5 02 44 89 ee
RSP: 0018:ffffc900031afb00 EFLAGS: 00000246
RAX: dffffc0000000000 RBX: ffff88805fa902b0 RCX: ffffffff81fdabe9
RDX: 1ffff1100bf5205b RSI: ffffffff81fc7f03 RDI: ffffffff8ddafde0
RBP: 0000000000000081 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000040 R11: 0000000000000001 R12: ffffffff8ddafde0
R13: 6f7267632f343132 R14: ffff88805fa902d8 R15: ffffc900031afce0
may_lookup fs/namei.c:1718 [inline]
link_path_walk.part.0.constprop.0+0x226/0xcd0 fs/namei.c:2273
link_path_walk fs/namei.c:2255 [inline]
path_lookupat+0x93/0x770 fs/namei.c:2492
filename_lookup+0x1e5/0x5b0 fs/namei.c:2522
user_path_at_empty+0x42/0x60 fs/namei.c:2929
user_path_at include/linux/namei.h:58 [inline]
ksys_umount fs/namespace.c:1916 [inline]
__do_sys_umount fs/namespace.c:1924 [inline]
__se_sys_umount fs/namespace.c:1922 [inline]
__x64_sys_umount+0x10e/0x1a0 fs/namespace.c:1922
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc13d777067
RSP: 002b:00007ffebad56cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: ffffffffffffffda RBX: 00007fc13d7e3672 RCX: 00007fc13d777067
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffebad56db0
RBP: 00007ffebad56db0 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffebad57e60
R13: 00007fc13d7e3672 R14: 0000000000073ce9 R15: 00007ffebad57ea0
task:syz-executor state:R running task stack:22824 pid:5097 tgid:5097 ppid:5083 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5408 [inline]
__schedule+0xf15/0x5d00 kernel/sched/core.c:6745
preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7067
irqentry_exit+0x36/0x90 kernel/entry/common.c:354
asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:707
RIP: 0010:lock_acquire+0x1f2/0x560 kernel/locking/lockdep.c:5722
Code: c1 05 3a af 96 7e 83 f8 01 0f 85 ea 02 00 00 9c 58 f6 c4 02 0f 85 d5 02 00 00 48 85 ed 74 01 fb 48 b8 00 00 00 00 00 fc ff df <48> 01 c3 48 c7 03 00 00 00 00 48 c7 43 08 00 00 00 00 48 8b 84 24
RSP: 0018:ffffc900032771a0 EFLAGS: 00000206
RAX: dffffc0000000000 RBX: 1ffff9200064ee36 RCX: 0000000090d59b2c
RDX: 0000000000000001 RSI: ffffffff8b2cb260 RDI: ffffffff8b8ff980
RBP: 0000000000000200 R08: 0000000000000000 R09: fffffbfff284cc58
R10: ffffffff942662c7 R11: 0000000000000004 R12: 0000000000000000
R13: 0000000000000000 R14: ffffffff8dbb1920 R15: 0000000000000000
rcu_lock_acquire include/linux/rcupdate.h:329 [inline]
rcu_read_lock include/linux/rcupdate.h:781 [inline]
jbd2_write_access_granted+0x9f/0x3d0 fs/jbd2/transaction.c:1188
jbd2_journal_get_write_access+0x196/0x280 fs/jbd2/transaction.c:1253
__ext4_journal_get_write_access+0x6a/0x390 fs/ext4/ext4_jbd2.c:239
ext4_reserve_inode_write+0x13b/0x270 fs/ext4/inode.c:5724
__ext4_mark_inode_dirty+0x1a6/0x890 fs/ext4/inode.c:5898
ext4_dirty_inode+0xd9/0x130 fs/ext4/inode.c:5935
__mark_inode_dirty+0x1f0/0xe70 fs/fs-writeback.c:2486
mark_inode_dirty include/linux/fs.h:2404 [inline]
dquot_alloc_space include/linux/quotaops.h:319 [inline]
dquot_alloc_block include/linux/quotaops.h:336 [inline]
ext4_mb_new_blocks+0x603/0x4e40 fs/ext4/mballoc.c:6185
ext4_ext_map_blocks+0x1c24/0x5cd0 fs/ext4/extents.c:4318
ext4_map_blocks+0x61d/0x17d0 fs/ext4/inode.c:623
ext4_getblk+0x17f/0x8a0 fs/ext4/inode.c:833
ext4_bread+0x2c/0x190 fs/ext4/inode.c:889
ext4_append+0x26d/0x560 fs/ext4/namei.c:83
ext4_init_new_dir+0x220/0x4c0 fs/ext4/namei.c:2977
ext4_mkdir+0x315/0xb70 fs/ext4/namei.c:3023
vfs_mkdir+0x57d/0x860 fs/namei.c:4131
do_mkdirat+0x301/0x3a0 fs/namei.c:4154
__do_sys_mkdirat fs/namei.c:4169 [inline]
__se_sys_mkdirat fs/namei.c:4167 [inline]
__x64_sys_mkdirat+0x114/0x170 fs/namei.c:4167
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7f4a774497
RSP: 002b:00007ffc0271d0b8 EFLAGS: 00000206 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007ffc0271d130 RCX: 00007f7f4a774497
RDX: 00000000000001ff RSI: 00007ffc0271d130 RDI: 00000000ffffff9c
RBP: 00007ffc0271d10c R08: 0000000000000005 R09: 00007ffc0271ce55
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000032
R13: 0000000000074047 R14: 0000000000073fab R15: 00007ffc0271d170
task:syz.0.1275 state:R running task stack:24400 pid:10593 tgid:10590 ppid:8426 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5408 [inline]
__schedule+0xf15/0x5d00 kernel/sched/core.c:6745
preempt_schedule_common+0x44/0xc0 kernel/sched/core.c:6924
preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk.S:12
__raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline]
_raw_spin_unlock+0x3e/0x50 kernel/locking/spinlock.c:186
spin_unlock include/linux/spinlock.h:391 [inline]
zap_pte_range mm/memory.c:1676 [inline]
zap_pmd_range mm/memory.c:1724 [inline]
zap_pud_range mm/memory.c:1753 [inline]
zap_p4d_range mm/memory.c:1774 [inline]
unmap_page_range+0xbc7/0x3f20 mm/memory.c:1795
unmap_single_vma+0x194/0x2b0 mm/memory.c:1841
unmap_vmas+0x22f/0x490 mm/memory.c:1885
exit_mmap+0x1b8/0xb20 mm/mmap.c:3341
__mmput+0x12a/0x4d0 kernel/fork.c:1346
mmput+0x62/0x70 kernel/fork.c:1368
exit_mm kernel/exit.c:565 [inline]
do_exit+0x9b7/0x2ba0 kernel/exit.c:861
do_group_exit+0xd3/0x2a0 kernel/exit.c:1023
get_signal+0x2616/0x2710 kernel/signal.c:2909
arch_do_signal_or_restart+0x90/0x7e0 arch/x86/kernel/signal.c:310
exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0x14a/0x2a0 kernel/entry/common.c:218
do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f093a575d39
RSP: 002b:00007f093b29c0f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f093a704078 RCX: 00007f093a575d39
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f093a704078
RBP: 00007f093a704070 R08: 00007f093b29c6c0 R09: 00007f093b29c6c0
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f093a70407c
R13: 000000000000006e R14: 00007ffcfc14dfc0 R15: 00007ffcfc14e0a8
rcu: rcu_preempt kthread starved for 10500 jiffies! g63825 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:27584 pid:17 tgid:17 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5408 [inline]
__schedule+0xf15/0x5d00 kernel/sched/core.c:6745
__schedule_loop kernel/sched/core.c:6822 [inline]
schedule+0xe7/0x350 kernel/sched/core.c:6837
schedule_timeout+0x136/0x2a0 kernel/time/timer.c:2581
rcu_gp_fqs_loop+0x1eb/0xb00 kernel/rcu/tree.c:2000
rcu_gp_kthread+0x271/0x380 kernel/rcu/tree.c:2202
kthread+0x2c1/0x3a0 kernel/kthread.c:389
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:48 [inline]
NMI backtrace for cpu 0 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:86 [inline]
NMI backtrace for cpu 0 skipped: idling at acpi_safe_halt+0x1a/0x20 drivers/acpi/processor_idle.c:112
sched: RT throttling activated