syzbot


INFO: rcu detected stall in sys_newfstatat (3)

Status: auto-closed as invalid on 2022/09/03 09:55
Reported-by: syzbot+@syzkaller.appspotmail.com
First crash: 183d, last: 183d
similar bugs (3):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: rcu detected stall in sys_newfstatat (4) C error 1 11d 41d 0/24 upstream: reported C repro on 2022/10/25 00:38
upstream INFO: rcu detected stall in sys_newfstatat 1 1097d 1097d 0/24 closed as invalid on 2019/12/04 14:04
upstream INFO: rcu detected stall in sys_newfstatat (2) 1 296d 296d 0/24 auto-closed as invalid on 2022/05/13 02:53

Sample crash report:
rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (1 GPs behind) idle=d0b/1/0x4000000000000000 softirq=137455/137456 fqs=5 
	(t=14488 jiffies g=204501 q=2033 ncpus=2)
rcu: rcu_preempt kthread timer wakeup didn't happen for 14463 jiffies! g204501 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=110213
rcu: rcu_preempt kthread starved for 14464 jiffies! g204501 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:26424 pid:   17 ppid:     2 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5116 [inline]
 __schedule+0x957/0xec0 kernel/sched/core.c:6428
 schedule+0xeb/0x1b0 kernel/sched/core.c:6500
 schedule_timeout+0x1b9/0x300 kernel/time/timer.c:1935
 rcu_gp_fqs_loop+0x2b9/0xfb0 kernel/rcu/tree.c:1999
 rcu_gp_kthread+0xa5/0x360 kernel/rcu/tree.c:2187
 kthread+0x266/0x300 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 30932 Comm: udevd Not tainted 5.18.0-syzkaller-13842-g952923ddc011 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:rcu_read_lock_sched_held+0xba/0x130 kernel/rcu/update.c:126
Code: 00 00 00 48 c7 04 24 0e 36 e0 45 49 c7 04 1e 00 00 00 00 65 48 8b 04 25 28 00 00 00 48 3b 44 24 48 75 6d 44 89 f8 48 8d 65 e0 <5b> 41 5c 41 5e 41 5f 5d c3 65 8b 05 7e 7f 92 7e 41 bf 01 00 00 00
RSP: 0018:ffffc90000007ae0 EFLAGS: 00000046
RAX: 0000000000000001 RBX: 1ffff92000000f50 RCX: 0000000000010003
RDX: 0000000000000000 RSI: ffffffff8a8d3520 RDI: ffffffff8ae98c20
RBP: ffffc90000007b00 R08: dffffc0000000000 R09: fffffbfff1c0701e
R10: fffffbfff1c0701e R11: 1ffffffff1c0701d R12: dffffc0000000000
R13: ffffffff81775569 R14: dffffc0000000000 R15: 0000000000000001
FS:  00007f693132b840(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe566c53310 CR3: 000000002d572000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 trace_lock_release+0x7a/0x190 include/trace/events/lock.h:69
 lock_release+0x81/0x870 kernel/locking/lockdep.c:5676
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:149 [inline]
 _raw_spin_unlock_irqrestore+0x75/0x130 kernel/locking/spinlock.c:194
 debug_hrtimer_deactivate kernel/time/hrtimer.c:425 [inline]
 debug_deactivate kernel/time/hrtimer.c:481 [inline]
 __run_hrtimer kernel/time/hrtimer.c:1653 [inline]
 __hrtimer_run_queues+0x2f9/0xa60 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x3a6/0xfd0 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1095 [inline]
 __sysvec_apic_timer_interrupt+0xf9/0x280 arch/x86/kernel/apic/apic.c:1112
 sysvec_apic_timer_interrupt+0x8c/0xb0 arch/x86/kernel/apic/apic.c:1106
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1b/0x20
RIP: 0010:tomoyo_realpath_from_path+0xf8/0x5f0 security/tomoyo/realpath.c:258
Code: be 40 0c 00 00 e8 48 3d e0 fd 48 85 c0 0f 84 bd 04 00 00 49 89 c7 45 8d 74 24 ff 4a 8d 1c 30 48 89 d8 48 c1 e8 03 0f b6 04 28 <84> c0 0f 85 da 03 00 00 c6 03 00 48 8b 44 24 50 80 3c 28 00 48 8b
RSP: 0018:ffffc9000584f890 EFLAGS: 00000a07
RAX: 0000000000000000 RBX: ffff88802da14fff RCX: 2471a358a002a700
RDX: ffffc9000584f638 RSI: 0000000000000001 RDI: 0000000000000c40
RBP: dffffc0000000000 R08: 000000000000000a R09: fffffbfff1c0701e
R10: fffffbfff1c0701e R11: 1ffffffff1c0701d R12: 0000000000001000
R13: ffffc9000584fc80 R14: 0000000000000fff R15: ffff88802da14000
 tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
 tomoyo_path_perm+0x270/0x6b0 security/tomoyo/file.c:822
 security_inode_getattr+0xc0/0x140 security/security.c:1344
 vfs_getattr+0x26/0x360 fs/stat.c:157
 vfs_statx+0x183/0x3f0 fs/stat.c:232
 vfs_fstatat fs/stat.c:255 [inline]
 __do_sys_newfstatat fs/stat.c:425 [inline]
 __se_sys_newfstatat+0xf6/0x790 fs/stat.c:419
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x46/0xb0
RIP: 0033:0x7f6930f251da
Code: 48 89 f2 b9 00 01 00 00 48 89 fe bf 9c ff ff ff e9 0b 00 00 00 66 2e 0f 1f 84 00 00 00 00 00 90 41 89 ca b8 06 01 00 00 0f 05 <3d> 00 f0 ff ff 77 07 31 c0 c3 0f 1f 40 00 48 8b 15 69 fc 0c 00 f7
RSP: 002b:00007ffd2303c268 EFLAGS: 00000206 ORIG_RAX: 0000000000000106
RAX: ffffffffffffffda RBX: 00007f6930ff2380 RCX: 00007f6930f251da
RDX: 00007ffd2303c270 RSI: 00007f6930fbb75a RDI: 0000000000000009
RBP: 000055bec13329c0 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000001000 R11: 0000000000000206 R12: 000055bebffbdf32
R13: 00007f6930ff2380 R14: 0000000000000002 R15: 00007ffd2303c8d8
 </TASK>
NMI backtrace for cpu 1
CPU: 1 PID: 4594 Comm: syz-executor.4 Not tainted 5.18.0-syzkaller-13842-g952923ddc011 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 nmi_cpu_backtrace+0x473/0x4a0 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x168/0x280 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x236/0x3a0 kernel/rcu/tree_stall.h:371
 print_cpu_stall kernel/rcu/tree_stall.h:668 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:753 [inline]
 rcu_pending kernel/rcu/tree.c:3977 [inline]
 rcu_sched_clock_irq+0xffe/0x19f0 kernel/rcu/tree.c:2675
 update_process_times+0x148/0x1b0 kernel/time/timer.c:1839
 tick_sched_handle kernel/time/tick-sched.c:243 [inline]
 tick_sched_timer+0x377/0x540 kernel/time/tick-sched.c:1481
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x4cb/0xa60 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x3a6/0xfd0 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1095 [inline]
 __sysvec_apic_timer_interrupt+0xf9/0x280 arch/x86/kernel/apic/apic.c:1112
 sysvec_apic_timer_interrupt+0x8c/0xb0 arch/x86/kernel/apic/apic.c:1106
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1b/0x20
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xd4/0x130 kernel/locking/spinlock.c:194
Code: 9c 8f 44 24 20 42 80 3c 23 00 74 08 4c 89 f7 e8 52 d9 a6 f7 f6 44 24 21 02 75 4e 41 f7 c7 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> a7 61 28 f7 65 8b 05 88 b8 ce 75 85 c0 74 3f 48 c7 04 24 0e 36
RSP: 0018:ffffc90007a77660 EFLAGS: 00000206
RAX: b653303eee50e800 RBX: 1ffff92000f4eed0 RCX: ffffffff81683c98
RDX: dffffc0000000000 RSI: ffffffff8a8d23a0 RDI: 0000000000000001
RBP: ffffc90007a776e8 R08: dffffc0000000000 R09: fffffbfff1fa8e0d
R10: fffffbfff1fa8e0d R11: 1ffffffff1fa8e0c R12: dffffc0000000000
R13: 1ffff92000f4eecc R14: ffffc90007a77680 R15: 0000000000000246
 spin_unlock_irqrestore include/linux/spinlock.h:404 [inline]
 __slab_free+0x1e7/0x280 mm/slub.c:3410
 do_slab_free mm/slub.c:3495 [inline]
 ___cache_free+0x118/0x1a0 mm/slub.c:3514
 qlist_free_all+0x2b/0x70 mm/kasan/quarantine.c:187
 kasan_quarantine_reduce+0x169/0x180 mm/kasan/quarantine.c:294
 __kasan_slab_alloc+0x2f/0xe0 mm/kasan/common.c:446
 kasan_slab_alloc include/linux/kasan.h:224 [inline]
 slab_post_alloc_hook mm/slab.h:750 [inline]
 slab_alloc_node mm/slub.c:3214 [inline]
 slab_alloc mm/slub.c:3222 [inline]
 __kmalloc+0x1bd/0x370 mm/slub.c:4413
 kmalloc include/linux/slab.h:605 [inline]
 kzalloc include/linux/slab.h:733 [inline]
 tomoyo_encode2 security/tomoyo/realpath.c:45 [inline]
 tomoyo_encode+0x26f/0x540 security/tomoyo/realpath.c:80
 tomoyo_path_perm+0x372/0x6b0 security/tomoyo/file.c:831
 tomoyo_path_symlink+0xda/0x110 security/tomoyo/tomoyo.c:199
 security_path_symlink+0xd6/0x160 security/security.c:1182
 do_symlinkat+0x129/0x610 fs/namei.c:4365
 __do_sys_symlinkat fs/namei.c:4387 [inline]
 __se_sys_symlinkat fs/namei.c:4384 [inline]
 __x64_sys_symlinkat+0x95/0xa0 fs/namei.c:4384
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x46/0xb0
RIP: 0033:0x7fc391688a17

================================
WARNING: inconsistent lock state
5.18.0-syzkaller-13842-g952923ddc011 #0 Not tainted
--------------------------------
inconsistent {HARDIRQ-ON-W} -> {IN-HARDIRQ-W} usage.
syz-executor.4/4594 [HC1[1]:SC0[0]:HE0:SE1] takes:
ffffffff8cbedbb8 (vmap_area_lock){?.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:349 [inline]
ffffffff8cbedbb8 (vmap_area_lock){?.+.}-{2:2}, at: find_vmap_area mm/vmalloc.c:1805 [inline]
ffffffff8cbedbb8 (vmap_area_lock){?.+.}-{2:2}, at: find_vm_area+0x1d/0x140 mm/vmalloc.c:2525
{HARDIRQ-ON-W} state was registered at:
  lock_acquire+0x1a7/0x400 kernel/locking/lockdep.c:5665
  __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
  _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154
  spin_lock include/linux/spinlock.h:349 [inline]
  alloc_vmap_area+0x18bb/0x1ae0 mm/vmalloc.c:1586
  __get_vm_area_node+0x18a/0x380 mm/vmalloc.c:2453
  get_vm_area_caller+0x45/0x50 mm/vmalloc.c:2506
  __ioremap_caller+0x510/0x920 arch/x86/mm/ioremap.c:280
  acpi_os_ioremap include/acpi/acpi_io.h:13 [inline]
  acpi_map drivers/acpi/osl.c:296 [inline]
  acpi_os_map_iomem+0x226/0x4b0 drivers/acpi/osl.c:355
  acpi_tb_acquire_table+0xf5/0x25d drivers/acpi/acpica/tbdata.c:142
  acpi_tb_validate_table drivers/acpi/acpica/tbdata.c:317 [inline]
  acpi_tb_validate_temp_table+0xa6/0x10b drivers/acpi/acpica/tbdata.c:400
  acpi_tb_verify_temp_table+0x82/0x8ed drivers/acpi/acpica/tbdata.c:504
  acpi_reallocate_root_table+0x328/0x584 drivers/acpi/acpica/tbxface.c:180
  acpi_early_init+0xdb/0x536 drivers/acpi/bus.c:1200
  start_kernel+0x40b/0x55b init/main.c:1098
  secondary_startup_64_no_verify+0xcf/0xdb
irq event stamp: 1838
hardirqs last  enabled at (1837): [<ffffffff8a33b62b>] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline]
hardirqs last  enabled at (1837): [<ffffffff8a33b62b>] _raw_spin_unlock_irqrestore+0x8b/0x130 kernel/locking/spinlock.c:194
hardirqs last disabled at (1838): [<ffffffff8a2ac15a>] sysvec_apic_timer_interrupt+0xa/0xb0 arch/x86/kernel/apic/apic.c:1106
softirqs last  enabled at (0): [<ffffffff814f7880>] copy_process+0x1530/0x3fa0 kernel/fork.c:2185
softirqs last disabled at (0): [<0000000000000000>] 0x0

other info that might help us debug this:
 Possible unsafe locking scenario:

       CPU0
       ----
  lock(vmap_area_lock);
  <Interrupt>
    lock(vmap_area_lock);

 *** DEADLOCK ***

5 locks held by syz-executor.4/4594:
 #0: ffff88807ee56460 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x3b/0x80 fs/namespace.c:393
 #1: ffff888038f90e08 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:776 [inline]
 #1: ffff888038f90e08 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: filename_create+0x24d/0x500 fs/namei.c:3746
 #2: ffffffff8d105788 (tomoyo_ss){....}-{0:0}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:268
 #3: ffffffff8cc05bd8 (remove_cache_srcu){....}-{0:0}, at: rcu_lock_acquire+0x0/0x30
 #4: ffffffff8cb23918 (rcu_node_0){-.-.}-{2:2}, at: rcu_dump_cpu_stacks+0xa5/0x3a0 kernel/rcu/tree_stall.h:366

stack backtrace:
CPU: 1 PID: 4594 Comm: syz-executor.4 Not tainted 5.18.0-syzkaller-13842-g952923ddc011 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 mark_lock_irq+0xb20/0xf00
 mark_lock+0x21c/0x350 kernel/locking/lockdep.c:4632
 mark_usage kernel/locking/lockdep.c:4524 [inline]
 __lock_acquire+0xb43/0x1f80 kernel/locking/lockdep.c:5007
 lock_acquire+0x1a7/0x400 kernel/locking/lockdep.c:5665
 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
 _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154
 spin_lock include/linux/spinlock.h:349 [inline]
 find_vmap_area mm/vmalloc.c:1805 [inline]
 find_vm_area+0x1d/0x140 mm/vmalloc.c:2525
 check_heap_object+0x33/0x870 mm/usercopy.c:176
 __check_object_size+0xad/0x210 mm/usercopy.c:252
 check_object_size include/linux/thread_info.h:199 [inline]
 __copy_from_user_inatomic include/linux/uaccess.h:62 [inline]
 copy_from_user_nmi+0x98/0x100 arch/x86/lib/usercopy.c:47
 copy_code arch/x86/kernel/dumpstack.c:91 [inline]
 show_opcodes+0xa2/0x120 arch/x86/kernel/dumpstack.c:121
 show_ip arch/x86/kernel/dumpstack.c:144 [inline]
 show_iret_regs+0x2f/0x60 arch/x86/kernel/dumpstack.c:149
 __show_regs+0x29/0x500 arch/x86/kernel/process_64.c:74
 show_regs_if_on_stack arch/x86/kernel/dumpstack.c:167 [inline]
 show_trace_log_lvl+0x562/0x630 arch/x86/kernel/dumpstack.c:292
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 nmi_cpu_backtrace+0x473/0x4a0 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x168/0x280 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x236/0x3a0 kernel/rcu/tree_stall.h:371
 print_cpu_stall kernel/rcu/tree_stall.h:668 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:753 [inline]
 rcu_pending kernel/rcu/tree.c:3977 [inline]
 rcu_sched_clock_irq+0xffe/0x19f0 kernel/rcu/tree.c:2675
 update_process_times+0x148/0x1b0 kernel/time/timer.c:1839
 tick_sched_handle kernel/time/tick-sched.c:243 [inline]
 tick_sched_timer+0x377/0x540 kernel/time/tick-sched.c:1481
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x4cb/0xa60 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x3a6/0xfd0 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1095 [inline]
 __sysvec_apic_timer_interrupt+0xf9/0x280 arch/x86/kernel/apic/apic.c:1112
 sysvec_apic_timer_interrupt+0x8c/0xb0 arch/x86/kernel/apic/apic.c:1106
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1b/0x20
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xd4/0x130 kernel/locking/spinlock.c:194
Code: 9c 8f 44 24 20 42 80 3c 23 00 74 08 4c 89 f7 e8 52 d9 a6 f7 f6 44 24 21 02 75 4e 41 f7 c7 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> a7 61 28 f7 65 8b 05 88 b8 ce 75 85 c0 74 3f 48 c7 04 24 0e 36
RSP: 0018:ffffc90007a77660 EFLAGS: 00000206
RAX: b653303eee50e800 RBX: 1ffff92000f4eed0 RCX: ffffffff81683c98
RDX: dffffc0000000000 RSI: ffffffff8a8d23a0 RDI: 0000000000000001
RBP: ffffc90007a776e8 R08: dffffc0000000000 R09: fffffbfff1fa8e0d
R10: fffffbfff1fa8e0d R11: 1ffffffff1fa8e0c R12: dffffc0000000000
R13: 1ffff92000f4eecc R14: ffffc90007a77680 R15: 0000000000000246
 spin_unlock_irqrestore include/linux/spinlock.h:404 [inline]
 __slab_free+0x1e7/0x280 mm/slub.c:3410
 do_slab_free mm/slub.c:3495 [inline]
 ___cache_free+0x118/0x1a0 mm/slub.c:3514
 qlist_free_all+0x2b/0x70 mm/kasan/quarantine.c:187
 kasan_quarantine_reduce+0x169/0x180 mm/kasan/quarantine.c:294
 __kasan_slab_alloc+0x2f/0xe0 mm/kasan/common.c:446
 kasan_slab_alloc include/linux/kasan.h:224 [inline]
 slab_post_alloc_hook mm/slab.h:750 [inline]
 slab_alloc_node mm/slub.c:3214 [inline]
 slab_alloc mm/slub.c:3222 [inline]
 __kmalloc+0x1bd/0x370 mm/slub.c:4413
 kmalloc include/linux/slab.h:605 [inline]
 kzalloc include/linux/slab.h:733 [inline]
 tomoyo_encode2 security/tomoyo/realpath.c:45 [inline]
 tomoyo_encode+0x26f/0x540 security/tomoyo/realpath.c:80
 tomoyo_path_perm+0x372/0x6b0 security/tomoyo/file.c:831
 tomoyo_path_symlink+0xda/0x110 security/tomoyo/tomoyo.c:199
 security_path_symlink+0xd6/0x160 security/security.c:1182
 do_symlinkat+0x129/0x610 fs/namei.c:4365
 __do_sys_symlinkat fs/namei.c:4387 [inline]
 __se_sys_symlinkat fs/namei.c:4384 [inline]
 __x64_sys_symlinkat+0x95/0xa0 fs/namei.c:4384
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x46/0xb0
RIP: 0033:0x7fc391688a17
Code: 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 0a 01 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd58e8fa98 EFLAGS: 00000206 ORIG_RAX: 000000000000010a
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fc391688a17
RDX: 00007fc3916e312e RSI: 00000000ffffff9c RDI: 00007fc3916e1e13
RBP: 0000000000000000 R08: 0000000000000000 R09: 00007ffd58e8f510
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000001 R15: 00007ffd58e8fb60
 </TASK>
Code: 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 0a 01 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd58e8fa98 EFLAGS: 00000206 ORIG_RAX: 000000000000010a
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fc391688a17
RDX: 00007fc3916e312e RSI: 00000000ffffff9c RDI: 00007fc3916e1e13
RBP: 0000000000000000 R08: 0000000000000000 R09: 00007ffd58e8f510
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000001 R15: 00007ffd58e8fb60
 </TASK>
----------------
Code disassembly (best guess), 1 bytes skipped:
   0:	00 00                	add    %al,(%rax)
   2:	48 c7 04 24 0e 36 e0 	movq   $0x45e0360e,(%rsp)
   9:	45
   a:	49 c7 04 1e 00 00 00 	movq   $0x0,(%r14,%rbx,1)
  11:	00
  12:	65 48 8b 04 25 28 00 	mov    %gs:0x28,%rax
  19:	00 00
  1b:	48 3b 44 24 48       	cmp    0x48(%rsp),%rax
  20:	75 6d                	jne    0x8f
  22:	44 89 f8             	mov    %r15d,%eax
  25:	48 8d 65 e0          	lea    -0x20(%rbp),%rsp
* 29:	5b                   	pop    %rbx <-- trapping instruction
  2a:	41 5c                	pop    %r12
  2c:	41 5e                	pop    %r14
  2e:	41 5f                	pop    %r15
  30:	5d                   	pop    %rbp
  31:	c3                   	retq
  32:	65 8b 05 7e 7f 92 7e 	mov    %gs:0x7e927f7e(%rip),%eax        # 0x7e927fb7
  39:	41 bf 01 00 00 00    	mov    $0x1,%r15d

Crashes (1):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-kasan-gce-smack-root 2022/06/05 09:46 upstream 952923ddc011 c8857892 .config log report info INFO: rcu detected stall in sys_newfstatat
* Struck through repros no longer work on HEAD.