rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P4513/1:b..l
rcu: (detected by 0, t=10503 jiffies, g=37361, q=11 ncpus=2)
task:udevd state:R running task stack:23824 pid:4513 tgid:4513 ppid:1 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5376 [inline]
__schedule+0x1961/0x4ab0 kernel/sched/core.c:6688
preempt_schedule_irq+0xfb/0x1b0 kernel/sched/core.c:7008
irqentry_exit+0x5a/0x80 kernel/entry/common.c:432
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645
RIP: 0010:lock_acquire+0x25a/0x530 kernel/locking/lockdep.c:5758
Code: 2b 00 74 08 4c 89 f7 e8 d4 5a 7d 00 f6 44 24 61 02 0f 85 8a 01 00 00 41 f7 c7 00 02 00 00 74 01 fb 48 c7 44 24 40 0e 36 e0 45 <4b> c7 44 25 00 00 00 00 00 43 c7 44 25 09 00 00 00 00 43 c7 44 25
RSP: 0018:ffffc900031bf700 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 1ffff92000637eec RCX: 0000000000000001
RDX: dffffc0000000000 RSI: ffffffff8b6abf60 RDI: ffffffff8bbdf200
RBP: ffffc900031bf848 R08: ffffffff90dd4367 R09: 1ffffffff21ba86c
R10: dffffc0000000000 R11: fffffbfff21ba86d R12: 1ffff92000637ee8
R13: dffffc0000000000 R14: ffffc900031bf760 R15: 0000000000000246
rcu_lock_acquire include/linux/rcupdate.h:301 [inline]
rcu_read_lock include/linux/rcupdate.h:747 [inline]
dput+0x6f/0x470 fs/dcache.c:899
step_into+0x355/0x1080 fs/namei.c:1855
walk_component fs/namei.c:2008 [inline]
link_path_walk+0x735/0xe70 fs/namei.c:2329
path_lookupat+0xa9/0x450 fs/namei.c:2482
filename_lookup+0x255/0x610 fs/namei.c:2512
user_path_at_empty+0x42/0x60 fs/namei.c:2911
do_readlinkat+0x118/0x3b0 fs/stat.c:494
__do_sys_readlink fs/stat.c:527 [inline]
__se_sys_readlink fs/stat.c:524 [inline]
__x64_sys_readlink+0x7f/0x90 fs/stat.c:524
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x45/0x110 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7fc69bb17d47
RSP: 002b:00007ffff8033058 EFLAGS: 00000246 ORIG_RAX: 0000000000000059
RAX: ffffffffffffffda RBX: 00007ffff8033068 RCX: 00007fc69bb17d47
RDX: 0000000000000400 RSI: 00007ffff8033068 RDI: 00007ffff8033548
RBP: 0000000000000400 R08: 000055afda0b5ee4 R09: 0000000000000000
R10: 0000000000000812 R11: 0000000000000246 R12: 00007ffff8033548
R13: 00007ffff80334b8 R14: 000055afda09c910 R15: 0000000000000000
rcu: rcu_preempt kthread starved for 10537 jiffies! g37361 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:R running task stack:24944 pid:17 tgid:17 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5376 [inline]
__schedule+0x1961/0x4ab0 kernel/sched/core.c:6688
__schedule_loop kernel/sched/core.c:6763 [inline]
schedule+0x149/0x260 kernel/sched/core.c:6778
schedule_timeout+0x1bd/0x300 kernel/time/timer.c:2167
rcu_gp_fqs_loop+0x30a/0x1500 kernel/rcu/tree.c:1631
rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:1830
kthread+0x2d3/0x370 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 10226 Comm: syz-executor.4 Not tainted 6.7.0-rc3-syzkaller-00033-g3b47bc037bd4 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
RIP: 0010:__kasan_check_read+0xa/0x20 mm/kasan/shadow.c:31
Code: 48 c7 c7 ae f9 12 8d 48 89 de eb 0a 48 c7 c7 e0 f9 12 8d 4c 89 fe e8 65 6d 29 09 31 db eb d4 90 f3 0f 1e fa 89 f6 48 8b 0c 24 <31> d2 e9 bf ea ff ff 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00
RSP: 0018:ffffc90009477a40 EFLAGS: 00000003
RAX: 0000000000000002 RBX: 00000000000000a7 RCX: ffffffff816d950a
RDX: 0000000000000008 RSI: 0000000000000008 RDI: ffffffff90dd4370
RBP: 0000000000000008 R08: ffffffff90dd4377 R09: 1ffffffff21ba86e
R10: dffffc0000000000 R11: fffffbfff21ba86f R12: 0000000000000001
R13: dffffc0000000000 R14: 0000000000000100 R15: ffff88801d9c4640
FS: 00007f30595166c0(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd4dfd78038 CR3: 000000001eba0000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
instrument_atomic_read include/linux/instrumented.h:68 [inline]
_test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]
hlock_class kernel/locking/lockdep.c:228 [inline]
mark_lock+0x9a/0x350 kernel/locking/lockdep.c:4656
mark_usage kernel/locking/lockdep.c:4599 [inline]
__lock_acquire+0xc09/0x1fd0 kernel/locking/lockdep.c:5091
lock_acquire+0x1e3/0x530 kernel/locking/lockdep.c:5754
__raw_spin_lock_irq include/linux/spinlock_api_smp.h:119 [inline]
_raw_spin_lock_irq+0xd3/0x120 kernel/locking/spinlock.c:170
spin_lock_irq include/linux/spinlock.h:376 [inline]
__set_current_blocked+0x11e/0x380 kernel/signal.c:3093
__do_sys_rt_sigreturn+0x16f/0x260 arch/x86/kernel/signal_64.c:261
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x45/0x110 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f305883ff39
Code: 64 c7 00 16 00 00 00 b8 ff ff ff ff c3 0f 1f 40 00 90 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 c7 c0 0f 00 00 00 0f 05 <0f> 1f 80 00 00 00 00 48 81 ec 48 01 00 00 49 89 d0 64 48 8b 04 25
RSP: 002b:00007f3059515b40 EFLAGS: 00000206 ORIG_RAX: 000000000000000f
RAX: ffffffffffffffda RBX: 00007f305899bf80 RCX: 00007f305883ff39
RDX: 00007f3059515b40 RSI: 00007f3059515c70 RDI: 0000000000000021
RBP: 00007f30588c847a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 000000000000000b R14: 00007f305899bf80 R15: 00007ffe62f02e28