syzbot


INFO: rcu detected stall in sys_sendfile64 (2)

Status: auto-closed as invalid on 2020/07/16 06:45
Reported-by: syzbot+5b31ebf58ec2861eb238@syzkaller.appspotmail.com
First crash: 1609d, last: 1557d
Similar bugs (7)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: rcu detected stall in sys_sendfile64 (3) mm 2 788d 789d 0/27 auto-closed as invalid on 2022/06/25 08:10
upstream INFO: rcu detected stall in sys_sendfile64 (4) net 1 530d 530d 0/27 auto-obsoleted due to no activity on 2023/04/18 07:19
upstream INFO: rcu detected stall in sys_sendfile64 lsm C 4 2013d 2012d 0/27 closed as invalid on 2018/12/19 10:12
upstream INFO: rcu detected stall in sys_sendfile64 (2) C done error 100 899d 1981d 0/27 closed as invalid on 2022/02/08 10:47
linux-6.1 INFO: rcu detected stall in sys_sendfile64 1 403d 403d 0/3 auto-obsoleted due to no activity on 2023/08/24 12:36
upstream INFO: rcu detected stall in sys_sendfile64 (5) fs 1 220d 220d 0/27 auto-obsoleted due to no activity on 2024/01/14 10:13
linux-4.19 INFO: rcu detected stall in sys_sendfile64 1 1892d 1892d 0/1 auto-closed as invalid on 2019/10/16 04:09

Sample crash report:
rcu: INFO: rcu_sched detected stalls on CPUs/tasks:
rcu: 	(detected by 0, t=10502 jiffies, g=157, q=1)
rcu: All QSes seen, last rcu_sched kthread activity 10500 (4294963744-4294953244), jiffies_till_next_fqs=1, root ->qsmask 0x0
syz-executor.5  R  running task    26320 13016   8131 0x00000000
Call Trace:
 <IRQ>
 sched_show_task kernel/sched/core.c:5338 [inline]
 sched_show_task.cold+0x2e2/0x343 kernel/sched/core.c:5313
 print_other_cpu_stall kernel/rcu/tree.c:1430 [inline]
 check_cpu_stall kernel/rcu/tree.c:1557 [inline]
 __rcu_pending kernel/rcu/tree.c:3293 [inline]
 rcu_pending kernel/rcu/tree.c:3336 [inline]
 rcu_check_callbacks.cold+0xaf0/0xddc kernel/rcu/tree.c:2682
 update_process_times+0x2a/0x70 kernel/time/timer.c:1638
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:168
 tick_sched_timer+0x42/0x130 kernel/time/tick-sched.c:1278
 __run_hrtimer kernel/time/hrtimer.c:1401 [inline]
 __hrtimer_run_queues+0x2fc/0xd50 kernel/time/hrtimer.c:1463
 hrtimer_interrupt+0x312/0x770 kernel/time/hrtimer.c:1521
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1067 [inline]
 smp_apic_timer_interrupt+0x10c/0x550 arch/x86/kernel/apic/apic.c:1092
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:893
 </IRQ>
RIP: 0010:copy_page_to_iter+0x2/0xdc0 lib/iov_iter.c:844
Code: 48 8b 7c 24 38 e8 ae f4 49 fe e9 e2 f9 ff ff 48 8b 7c 24 28 e8 1f f4 49 fe e9 ad f9 ff ff 66 2e 0f 1f 84 00 00 00 00 00 41 57 <41> 56 41 55 49 89 fd 41 54 49 89 cc 55 48 89 d5 53 48 89 f3 48 83
RSP: 0018:ffff8880617ef800 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000040000 RBX: 0000000000000b10 RCX: ffff8880617efa48
RDX: 000000000000007e RSI: 0000000000000b10 RDI: ffffea0001444180
RBP: 000000000000007e R08: ffff8880892921c0 R09: ffffed101295d939
R10: ffffed101295d938 R11: ffff888094aec9c3 R12: ffff888094aec9c0
R13: 0000000000000b10 R14: dffffc0000000000 R15: ffffea0001444180
 generic_file_buffered_read mm/filemap.c:2208 [inline]
 generic_file_read_iter+0x8b3/0x2810 mm/filemap.c:2385
 ext4_file_read_iter+0x17b/0x3a0 fs/ext4/file.c:78
 call_read_iter include/linux/fs.h:1814 [inline]
 generic_file_splice_read+0x3fa/0x6d0 fs/splice.c:308
 do_splice_to+0x10e/0x160 fs/splice.c:881
 splice_direct_to_actor+0x2b9/0x8d0 fs/splice.c:959
 do_splice_direct+0x1a8/0x270 fs/splice.c:1068
 do_sendfile+0x549/0xc10 fs/read_write.c:1447
 __do_sys_sendfile64 fs/read_write.c:1502 [inline]
 __se_sys_sendfile64 fs/read_write.c:1494 [inline]
 __x64_sys_sendfile64+0x149/0x210 fs/read_write.c:1494
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45c849
Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fd82758bc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007fd82758c6d4 RCX: 000000000045c849
RDX: 00000000200001c0 RSI: 0000000000000008 RDI: 0000000000000008
RBP: 000000000076c040 R08: 0000000000000000 R09: 0000000000000000
R10: 00008080fffffffe R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000008d0 R14: 00000000004cb74a R15: 000000000076c04c
rcu: rcu_sched kthread starved for 10500 jiffies! g157 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
rcu: RCU grace-period kthread stack dump:
rcu_sched       R  running task    29744    11      2 0x80000000
Call Trace:
 schedule+0x8d/0x1b0 kernel/sched/core.c:3559
 schedule_timeout+0x4d1/0xf20 kernel/time/timer.c:1806
 rcu_gp_kthread+0xcee/0x2060 kernel/rcu/tree.c:2202
 kthread+0x34a/0x420 kernel/kthread.c:246
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 0, t=10548 jiffies, g=24737, q=50)
rcu: All QSes seen, last rcu_preempt kthread activity 10548 (4294963792-4294953244), jiffies_till_next_fqs=1, root ->qsmask 0x0
syz-executor.5  R  running task    26320 13016   8131 0x80000000
Call Trace:
 <IRQ>
 sched_show_task kernel/sched/core.c:5338 [inline]
 sched_show_task.cold+0x2e2/0x343 kernel/sched/core.c:5313
 print_other_cpu_stall kernel/rcu/tree.c:1430 [inline]
 check_cpu_stall kernel/rcu/tree.c:1557 [inline]
 __rcu_pending kernel/rcu/tree.c:3293 [inline]
 rcu_pending kernel/rcu/tree.c:3336 [inline]
 rcu_check_callbacks.cold+0xaf0/0xddc kernel/rcu/tree.c:2682
 update_process_times+0x2a/0x70 kernel/time/timer.c:1638
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:168
 tick_sched_timer+0x42/0x130 kernel/time/tick-sched.c:1278
 __run_hrtimer kernel/time/hrtimer.c:1401 [inline]
 __hrtimer_run_queues+0x2fc/0xd50 kernel/time/hrtimer.c:1463
 hrtimer_interrupt+0x312/0x770 kernel/time/hrtimer.c:1521
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1067 [inline]
 smp_apic_timer_interrupt+0x10c/0x550 arch/x86/kernel/apic/apic.c:1092
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:893
 </IRQ>
RIP: 0010:copy_page_to_iter+0x2/0xdc0 lib/iov_iter.c:844
Code: 48 8b 7c 24 38 e8 ae f4 49 fe e9 e2 f9 ff ff 48 8b 7c 24 28 e8 1f f4 49 fe e9 ad f9 ff ff 66 2e 0f 1f 84 00 00 00 00 00 41 57 <41> 56 41 55 49 89 fd 41 54 49 89 cc 55 48 89 d5 53 48 89 f3 48 83
RSP: 0018:ffff8880617ef800 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000040000 RBX: 0000000000000b10 RCX: ffff8880617efa48
RDX: 000000000000007e RSI: 0000000000000b10 RDI: ffffea0001444180
RBP: 000000000000007e R08: ffff8880892921c0 R09: ffffed101295d939
R10: ffffed101295d938 R11: ffff888094aec9c3 R12: ffff888094aec9c0
R13: 0000000000000b10 R14: dffffc0000000000 R15: ffffea0001444180
 generic_file_buffered_read mm/filemap.c:2208 [inline]
 generic_file_read_iter+0x8b3/0x2810 mm/filemap.c:2385
 ext4_file_read_iter+0x17b/0x3a0 fs/ext4/file.c:78
 call_read_iter include/linux/fs.h:1814 [inline]
 generic_file_splice_read+0x3fa/0x6d0 fs/splice.c:308
 do_splice_to+0x10e/0x160 fs/splice.c:881
 splice_direct_to_actor+0x2b9/0x8d0 fs/splice.c:959
 do_splice_direct+0x1a8/0x270 fs/splice.c:1068
 do_sendfile+0x549/0xc10 fs/read_write.c:1447
 __do_sys_sendfile64 fs/read_write.c:1502 [inline]
 __se_sys_sendfile64 fs/read_write.c:1494 [inline]
 __x64_sys_sendfile64+0x149/0x210 fs/read_write.c:1494
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45c849
Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fd82758bc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007fd82758c6d4 RCX: 000000000045c849
RDX: 00000000200001c0 RSI: 0000000000000008 RDI: 0000000000000008
RBP: 000000000076c040 R08: 0000000000000000 R09: 0000000000000000
R10: 00008080fffffffe R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000008d0 R14: 00000000004cb74a R15: 000000000076c04c
rcu: rcu_preempt kthread starved for 10548 jiffies! g24737 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
rcu: RCU grace-period kthread stack dump:
rcu_preempt     R  running task    29056    10      2 0x80000000
Call Trace:
 schedule+0x8d/0x1b0 kernel/sched/core.c:3559
 schedule_timeout+0x4d1/0xf20 kernel/time/timer.c:1806
 rcu_gp_kthread+0xcee/0x2060 kernel/rcu/tree.c:2202
 kthread+0x34a/0x420 kernel/kthread.c:246
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2020/03/18 06:44 linux-4.19.y 93556fb211fa 97bc55ce .config console log report ci2-linux-4-19
2020/02/12 20:20 linux-4.19.y 357668399cf7 84f4fc8a .config console log report ci2-linux-4-19
2020/01/26 16:06 linux-4.19.y d183c8e2647a dd56146d .config console log report ci2-linux-4-19
* Struck through repros no longer work on HEAD.