syzbot


INFO: rcu detected stall in proc_sys_call_handler

Status: auto-closed as invalid on 2022/09/09 16:54
Reported-by: syzbot+@syzkaller.appspotmail.com
First crash: 177d, last: 177d

Sample crash report:
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (1 GPs behind) idle=c61/1/0x4000000000000000 softirq=131544/131545 fqs=3 
	(detected by 0, t=10502 jiffies, g=185661, q=754 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 12630 Comm: syz-executor.0 Not tainted 5.19.0-rc1-syzkaller-00262-g0885eacdc81f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x0/0x20 kernel/kcov.c:297
Code: 66 2e 0f 1f 84 00 00 00 00 00 48 8b 0c 24 0f b7 d6 0f b7 f7 bf 03 00 00 00 e9 bc fe ff ff 66 66 2e 0f 1f 84 00 00 00 00 00 90 <48> 8b 0c 24 89 f2 89 fe bf 05 00 00 00 e9 9e fe ff ff 66 66 2e 0f
RSP: 0018:ffffc900001f0e38 EFLAGS: 00000046
RAX: 0000000000000001 RBX: ffff888021175b40 RCX: 0000000000000001
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: 17eda3ed2fdb47da
R13: ffff8880b9b2a600 R14: ffff8880b9b2a500 R15: 0000000000000001
FS:  00007fb180c21700(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbe5745d718 CR3: 000000002af91000 CR4: 0000000000350ee0
Call Trace:
 <IRQ>
 trace_hrtimer_cancel include/trace/events/timer.h:293 [inline]
 debug_deactivate kernel/time/hrtimer.c:482 [inline]
 __run_hrtimer kernel/time/hrtimer.c:1653 [inline]
 __hrtimer_run_queues+0xab7/0xe50 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1095 [inline]
 __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1112
 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1106
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:649
RIP: 0010:preempt_schedule_irq+0x49/0x90 kernel/sched/core.c:6736
Code: 55 53 65 48 8b 1c 25 80 6f 02 00 48 89 dd 48 c1 ed 03 48 01 c5 bf 01 00 00 00 e8 42 12 d9 f7 e8 fd e0 07 f8 fb bf 01 00 00 00 <e8> d2 a7 ff ff 9c 58 fa f6 c4 02 75 27 bf 01 00 00 00 e8 40 f9 d8
RSP: 0018:ffffc90014e3f358 EFLAGS: 00000202
RAX: 0000000000000efd RBX: ffff88801e590000 RCX: 1ffffffff20d730e
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001
RBP: ffffed1003cb2000 R08: 0000000000000001 R09: ffffffff9067b9a7
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 irqentry_exit+0x31/0x80 kernel/entry/common.c:428
 asm_sysvec_reschedule_ipi+0x1b/0x20 arch/x86/include/asm/idtentry.h:654
RIP: 0010:is_idle_task include/linux/sched.h:1888 [inline]
RIP: 0010:__might_resched+0x199/0x2c0 kernel/sched/core.c:9756
Code: 84 2c ff ff ff 65 4c 8b 2c 25 80 6f 02 00 49 8d 7d 2c 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 <83> e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 0a 01 00 00 41 f6 45 2c
RSP: 0018:ffffc90014e3f428 EFLAGS: 00000217
RAX: ffff88801e59002c RBX: 0000000000000000 RCX: 0000000000000001
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88801e59002c
RBP: ffffffff89d6d0c0 R08: 0000000000000001 R09: ffffffff9067b9a7
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000220
R13: ffff88801e590000 R14: ffff88801e590000 R15: 00000000000004df
 invalidate_mapping_pagevec+0x2d1/0x5c0 mm/truncate.c:544
 drop_pagecache_sb+0xcf/0x2a0 fs/drop_caches.c:39
 iterate_supers+0x13c/0x290 fs/super.c:694
 drop_caches_sysctl_handler+0xdb/0x110 fs/drop_caches.c:62
 proc_sys_call_handler+0x4a1/0x6e0 fs/proc/proc_sysctl.c:611
 call_write_iter include/linux/fs.h:2058 [inline]
 do_iter_readv_writev+0x3d1/0x640 fs/read_write.c:742
 do_iter_write+0x182/0x700 fs/read_write.c:868
 vfs_iter_write+0x70/0xa0 fs/read_write.c:909
 iter_file_splice_write+0x723/0xc70 fs/splice.c:689
 do_splice_from fs/splice.c:767 [inline]
 direct_splice_actor+0x110/0x180 fs/splice.c:936
 splice_direct_to_actor+0x34b/0x8c0 fs/splice.c:891
 do_splice_direct+0x1a7/0x270 fs/splice.c:979
 do_sendfile+0xae0/0x1240 fs/read_write.c:1262
 __do_sys_sendfile64 fs/read_write.c:1321 [inline]
 __se_sys_sendfile64 fs/read_write.c:1313 [inline]
 __x64_sys_sendfile64+0x149/0x210 fs/read_write.c:1313
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x46/0xb0
RIP: 0033:0x7fb17fa89109
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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fb180c21168 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007fb17fb9bf60 RCX: 00007fb17fa89109
RDX: 0000000020002080 RSI: 0000000000000003 RDI: 0000000000000004
RBP: 00007fb17fae30ad R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000869 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffd352c3aff R14: 00007fb180c21300 R15: 0000000000022000
 </TASK>
rcu: rcu_preempt kthread starved for 10496 jiffies! g185661 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:28656 pid:   17 ppid:     2 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5116 [inline]
 __schedule+0xa00/0x4b30 kernel/sched/core.c:6428
 schedule+0xd2/0x1f0 kernel/sched/core.c:6500
 schedule_timeout+0x14a/0x2a0 kernel/time/timer.c:1935
 rcu_gp_fqs_loop+0x186/0x810 kernel/rcu/tree.c:1999
 rcu_gp_kthread+0x1de/0x320 kernel/rcu/tree.c:2187
 kthread+0x2e9/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
NMI backtrace for cpu 0
CPU: 0 PID: 8105 Comm: kworker/u4:5 Not tainted 5.19.0-rc1-syzkaller-00262-g0885eacdc81f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_unbound toggle_allocation_gate
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x1e6/0x230 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_check_gp_kthread_starvation.cold+0x1fb/0x200 kernel/rcu/tree_stall.h:518
 print_other_cpu_stall kernel/rcu/tree_stall.h:623 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:771 [inline]
 rcu_pending kernel/rcu/tree.c:3977 [inline]
 rcu_sched_clock_irq+0x2316/0x2370 kernel/rcu/tree.c:2675
 update_process_times+0x11a/0x1a0 kernel/time/timer.c:1839
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:243
 tick_sched_timer+0xee/0x120 kernel/time/tick-sched.c:1481
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x1c0/0xe50 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1095 [inline]
 __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1112
 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1106
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:649
RIP: 0010:csd_lock_wait kernel/smp.c:414 [inline]
RIP: 0010:smp_call_function_many_cond+0x499/0x1110 kernel/smp.c:988
Code: 01 89 ee e8 99 94 0a 00 85 ed 74 47 48 8b 04 24 49 89 c4 83 e0 07 49 c1 ec 03 48 89 c5 4d 01 fc 83 c5 03 e8 39 98 0a 00 f3 90 <41> 0f b6 04 24 40 38 c5 7c 08 84 c0 0f 85 21 0a 00 00 8b 43 08 31
RSP: 0018:ffffc9000682f950 EFLAGS: 00000293
RAX: 0000000000000000 RBX: ffff8880b9b401e0 RCX: 0000000000000000
RDX: ffff88806c3abb00 RSI: ffffffff816fdaf7 RDI: 0000000000000005
RBP: 0000000000000003 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: ffffed101736803d
R13: 0000000000000001 R14: 0000000000000001 R15: dffffc0000000000
 on_each_cpu_cond_mask+0x56/0xa0 kernel/smp.c:1154
 on_each_cpu include/linux/smp.h:71 [inline]
 text_poke_sync arch/x86/kernel/alternative.c:1231 [inline]
 text_poke_bp_batch+0x233/0x6c0 arch/x86/kernel/alternative.c:1419
 text_poke_flush arch/x86/kernel/alternative.c:1589 [inline]
 text_poke_flush arch/x86/kernel/alternative.c:1586 [inline]
 text_poke_finish+0x16/0x30 arch/x86/kernel/alternative.c:1596
 arch_jump_label_transform_apply+0x13/0x20 arch/x86/kernel/jump_label.c:146
 jump_label_update+0x32f/0x410 kernel/jump_label.c:830
 static_key_enable_cpuslocked+0x1b1/0x260 kernel/jump_label.c:177
 static_key_enable+0x16/0x20 kernel/jump_label.c:190
 toggle_allocation_gate mm/kfence/core.c:808 [inline]
 toggle_allocation_gate+0x100/0x390 mm/kfence/core.c:800
 process_one_work+0x996/0x1610 kernel/workqueue.c:2289
 worker_thread+0x665/0x1080 kernel/workqueue.c:2436
 kthread+0x2e9/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302
 </TASK>
watchdog: BUG: soft lockup - CPU#0 stuck for 225s! [kworker/u4:5:8105]
Modules linked in:
irq event stamp: 4235586
hardirqs last  enabled at (4235585): [<ffffffff89800c8b>] asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:649
hardirqs last disabled at (4235586): [<ffffffff89770cbb>] sysvec_apic_timer_interrupt+0xb/0xc0 arch/x86/kernel/apic/apic.c:1106
softirqs last  enabled at (4187392): [<ffffffff81484a93>] invoke_softirq kernel/softirq.c:445 [inline]
softirqs last  enabled at (4187392): [<ffffffff81484a93>] __irq_exit_rcu+0x123/0x180 kernel/softirq.c:650
softirqs last disabled at (4187345): [<ffffffff81484a93>] invoke_softirq kernel/softirq.c:445 [inline]
softirqs last disabled at (4187345): [<ffffffff81484a93>] __irq_exit_rcu+0x123/0x180 kernel/softirq.c:650
CPU: 0 PID: 8105 Comm: kworker/u4:5 Not tainted 5.19.0-rc1-syzkaller-00262-g0885eacdc81f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:csd_lock_wait kernel/smp.c:414 [inline]
RIP: 0010:smp_call_function_many_cond+0x499/0x1110 kernel/smp.c:988
Code: 01 89 ee e8 99 94 0a 00 85 ed 74 47 48 8b 04 24 49 89 c4 83 e0 07 49 c1 ec 03 48 89 c5 4d 01 fc 83 c5 03 e8 39 98 0a 00 f3 90 <41> 0f b6 04 24 40 38 c5 7c 08 84 c0 0f 85 21 0a 00 00 8b 43 08 31
RSP: 0018:ffffc9000682f950 EFLAGS: 00000293
RAX: 0000000000000000 RBX: ffff8880b9b401e0 RCX: 0000000000000000
RDX: ffff88806c3abb00 RSI: ffffffff816fdaf7 RDI: 0000000000000005
RBP: 0000000000000003 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: ffffed101736803d
R13: 0000000000000001 R14: 0000000000000001 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe4e3998000 CR3: 000000000ba8e000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 on_each_cpu_cond_mask+0x56/0xa0 kernel/smp.c:1154
 on_each_cpu include/linux/smp.h:71 [inline]
 text_poke_sync arch/x86/kernel/alternative.c:1231 [inline]
 text_poke_bp_batch+0x233/0x6c0 arch/x86/kernel/alternative.c:1419
 text_poke_flush arch/x86/kernel/alternative.c:1589 [inline]
 text_poke_flush arch/x86/kernel/alternative.c:1586 [inline]
 text_poke_finish+0x16/0x30 arch/x86/kernel/alternative.c:1596
 arch_jump_label_transform_apply+0x13/0x20 arch/x86/kernel/jump_label.c:146
 jump_label_update+0x32f/0x410 kernel/jump_label.c:830
 static_key_enable_cpuslocked+0x1b1/0x260 kernel/jump_label.c:177
 static_key_enable+0x16/0x20 kernel/jump_label.c:190
 toggle_allocation_gate mm/kfence/core.c:808 [inline]
 toggle_allocation_gate+0x100/0x390 mm/kfence/core.c:800
 process_one_work+0x996/0x1610 kernel/workqueue.c:2289
 worker_thread+0x665/0x1080 kernel/workqueue.c:2436
 kthread+0x2e9/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 12630 Comm: syz-executor.0 Not tainted 5.19.0-rc1-syzkaller-00262-g0885eacdc81f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:memory_is_nonzero mm/kasan/generic.c:101 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:128 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/generic.c:159 [inline]
RIP: 0010:check_region_inline mm/kasan/generic.c:180 [inline]
RIP: 0010:kasan_check_range+0x63/0x180 mm/kasan/generic.c:189
Code: 00 00 00 00 00 fc ff df 4d 89 ca 48 c1 ed 03 49 c1 ea 03 48 01 c5 49 01 c2 48 89 e8 49 8d 5a 01 48 89 da 48 29 ea 48 83 fa 10 <7e> 63 41 89 eb 41 83 e3 07 75 74 4c 8d 5a 07 48 85 d2 4c 0f 49 da
RSP: 0018:ffffc900001f0ad0 EFLAGS: 00000083
RAX: fffffbfff20cf720 RBX: fffffbfff20cf721 RCX: ffffffff815df3eb
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffffffff9067b900
RBP: fffffbfff20cf720 R08: 0000000000000000 R09: ffffffff9067b907
R10: fffffbfff20cf720 R11: 0000000000000001 R12: ffff88801e590ad8
R13: ffff88801e590000 R14: 0000000000044000 R15: 00000000000c4000
FS:  00007fb180c21700(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbe5745d718 CR3: 000000002af91000 CR4: 0000000000350ee0
Call Trace:
 <IRQ>
 instrument_atomic_read include/linux/instrumented.h:71 [inline]
 test_bit include/asm-generic/bitops/instrumented-non-atomic.h:134 [inline]
 hlock_class kernel/locking/lockdep.c:227 [inline]
 check_wait_context kernel/locking/lockdep.c:4727 [inline]
 __lock_acquire+0x3eb/0x5660 kernel/locking/lockdep.c:5003
 lock_acquire kernel/locking/lockdep.c:5665 [inline]
 lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5630
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:162
 debug_object_deactivate lib/debugobjects.c:732 [inline]
 debug_object_deactivate+0x101/0x300 lib/debugobjects.c:720
 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+0x3f8/0xe50 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1095 [inline]
 __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1112
 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1106
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:649
RIP: 0010:preempt_schedule_irq+0x49/0x90 kernel/sched/core.c:6736
Code: 55 53 65 48 8b 1c 25 80 6f 02 00 48 89 dd 48 c1 ed 03 48 01 c5 bf 01 00 00 00 e8 42 12 d9 f7 e8 fd e0 07 f8 fb bf 01 00 00 00 <e8> d2 a7 ff ff 9c 58 fa f6 c4 02 75 27 bf 01 00 00 00 e8 40 f9 d8
RSP: 0018:ffffc90014e3f358 EFLAGS: 00000202
RAX: 0000000000000efd RBX: ffff88801e590000 RCX: 1ffffffff20d730e
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001
RBP: ffffed1003cb2000 R08: 0000000000000001 R09: ffffffff9067b9a7
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 irqentry_exit+0x31/0x80 kernel/entry/common.c:428
 asm_sysvec_reschedule_ipi+0x1b/0x20 arch/x86/include/asm/idtentry.h:654
RIP: 0010:is_idle_task include/linux/sched.h:1888 [inline]
RIP: 0010:__might_resched+0x199/0x2c0 kernel/sched/core.c:9756
Code: 84 2c ff ff ff 65 4c 8b 2c 25 80 6f 02 00 49 8d 7d 2c 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 <83> e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 0a 01 00 00 41 f6 45 2c
RSP: 0018:ffffc90014e3f428 EFLAGS: 00000217
RAX: ffff88801e59002c RBX: 0000000000000000 RCX: 0000000000000001
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88801e59002c
RBP: ffffffff89d6d0c0 R08: 0000000000000001 R09: ffffffff9067b9a7
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000220
R13: ffff88801e590000 R14: ffff88801e590000 R15: 00000000000004df
 invalidate_mapping_pagevec+0x2d1/0x5c0 mm/truncate.c:544
 drop_pagecache_sb+0xcf/0x2a0 fs/drop_caches.c:39
 iterate_supers+0x13c/0x290 fs/super.c:694
 drop_caches_sysctl_handler+0xdb/0x110 fs/drop_caches.c:62
 proc_sys_call_handler+0x4a1/0x6e0 fs/proc/proc_sysctl.c:611
 call_write_iter include/linux/fs.h:2058 [inline]
 do_iter_readv_writev+0x3d1/0x640 fs/read_write.c:742
 do_iter_write+0x182/0x700 fs/read_write.c:868
 vfs_iter_write+0x70/0xa0 fs/read_write.c:909
 iter_file_splice_write+0x723/0xc70 fs/splice.c:689
 do_splice_from fs/splice.c:767 [inline]
 direct_splice_actor+0x110/0x180 fs/splice.c:936
 splice_direct_to_actor+0x34b/0x8c0 fs/splice.c:891
 do_splice_direct+0x1a7/0x270 fs/splice.c:979
 do_sendfile+0xae0/0x1240 fs/read_write.c:1262
 __do_sys_sendfile64 fs/read_write.c:1321 [inline]
 __se_sys_sendfile64 fs/read_write.c:1313 [inline]
 __x64_sys_sendfile64+0x149/0x210 fs/read_write.c:1313
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x46/0xb0
RIP: 0033:0x7fb17fa89109
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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fb180c21168 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007fb17fb9bf60 RCX: 00007fb17fa89109
RDX: 0000000020002080 RSI: 0000000000000003 RDI: 0000000000000004
RBP: 00007fb17fae30ad R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000869 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffd352c3aff R14: 00007fb180c21300 R15: 0000000000022000
 </TASK>
----------------
Code disassembly (best guess):
   0:	66 2e 0f 1f 84 00 00 	nopw   %cs:0x0(%rax,%rax,1)
   7:	00 00 00
   a:	48 8b 0c 24          	mov    (%rsp),%rcx
   e:	0f b7 d6             	movzwl %si,%edx
  11:	0f b7 f7             	movzwl %di,%esi
  14:	bf 03 00 00 00       	mov    $0x3,%edi
  19:	e9 bc fe ff ff       	jmpq   0xfffffeda
  1e:	66 66 2e 0f 1f 84 00 	data16 nopw %cs:0x0(%rax,%rax,1)
  25:	00 00 00 00
  29:	90                   	nop
* 2a:	48 8b 0c 24          	mov    (%rsp),%rcx <-- trapping instruction
  2e:	89 f2                	mov    %esi,%edx
  30:	89 fe                	mov    %edi,%esi
  32:	bf 05 00 00 00       	mov    $0x5,%edi
  37:	e9 9e fe ff ff       	jmpq   0xfffffeda
  3c:	66                   	data16
  3d:	66                   	data16
  3e:	2e                   	cs
  3f:	0f                   	.byte 0xf

Crashes (1):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-kasan-gce-root 2022/06/11 16:44 upstream 0885eacdc81f 0d5abf15 .config log report info INFO: rcu detected stall in proc_sys_call_handler
* Struck through repros no longer work on HEAD.