syzbot


INFO: rcu detected stall in generic_file_write_iter

Status: auto-obsoleted due to no activity on 2024/11/12 08:46
Reported-by: syzbot+879b1eed75b2b0b43b9b@syzkaller.appspotmail.com
First crash: 225d, last: 112d
Similar bugs (11)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: rcu detected stall in generic_file_write_iter (3) kernel 1 1826d 1825d 0/28 closed as invalid on 2019/12/04 14:04
upstream INFO: rcu detected stall in generic_file_write_iter (2) exfat 2 2040d 2080d 0/28 auto-closed as invalid on 2019/10/25 09:01
upstream BUG: soft lockup in generic_file_write_iter (2) mm 8 511d 499d 0/28 auto-obsoleted due to no activity on 2023/10/18 13:34
linux-5.15 INFO: rcu detected stall in generic_file_write_iter (2) 20 7d22h 269d 0/3 upstream: reported on 2024/03/08 18:29
linux-5.15 INFO: rcu detected stall in generic_file_write_iter 1 455d 455d 0/3 auto-obsoleted due to no activity on 2023/12/13 17:16
upstream INFO: rcu detected stall in generic_file_write_iter (4) cgroups 1 1758d 1754d 0/28 auto-closed as invalid on 2020/05/09 11:43
upstream BUG: soft lockup in generic_file_write_iter net 2 697d 732d 0/28 auto-obsoleted due to no activity on 2023/04/05 19:12
upstream INFO: rcu detected stall in generic_file_write_iter mm 58 2104d 2246d 0/28 closed as dup on 2018/10/27 15:28
upstream INFO: rcu detected stall in generic_file_write_iter (5) fs 2 1593d 1600d 0/28 auto-closed as invalid on 2020/10/22 01:02
upstream INFO: rcu detected stall in generic_file_write_iter (6) cgroups mm 2 1078d 1135d 0/28 closed as invalid on 2022/02/08 09:50
android-5-15 BUG: soft lockup in generic_file_write_iter 1 205d 205d 0/2 auto-obsoleted due to no activity on 2024/08/10 08:10

Sample crash report:
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P8204/1:b..l
	(detected by 1, t=10502 jiffies, g=47349, q=364 ncpus=2)
task:syz.3.1053      state:R  running task     stack:25096 pid:8204  ppid:7945   flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5241 [inline]
 __schedule+0x143f/0x4570 kernel/sched/core.c:6558
 preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6870
 irqentry_exit+0x53/0x80 kernel/entry/common.c:439
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:653
RIP: 0010:lock_acquire+0x26f/0x5a0 kernel/locking/lockdep.c:5666
Code: 2b 00 74 08 4c 89 f7 e8 0f a7 77 00 f6 44 24 61 02 0f 85 84 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:ffffc90004c675a0 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 1ffff9200098cec0 RCX: 1ffff9200098ce60
RDX: dffffc0000000000 RSI: ffffffff8b0c13e0 RDI: ffffffff8b5d5e20
RBP: ffffc90004c676e8 R08: dffffc0000000000 R09: fffffbfff20e7445
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff9200098cebc
R13: dffffc0000000000 R14: ffffc90004c67600 R15: 0000000000000246
 rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
 rcu_read_lock include/linux/rcupdate.h:791 [inline]
 mapping_get_entry mm/filemap.c:1850 [inline]
 __filemap_get_folio+0x171/0xe80 mm/filemap.c:1915
 shmem_get_folio_gfp+0x356/0x3470 mm/shmem.c:1881
 shmem_get_folio mm/shmem.c:2072 [inline]
 shmem_write_begin+0x16e/0x4e0 mm/shmem.c:2559
 generic_perform_write+0x2fc/0x5e0 mm/filemap.c:3817
 __generic_file_write_iter+0x176/0x400 mm/filemap.c:3945
 generic_file_write_iter+0xab/0x310 mm/filemap.c:3977
 call_write_iter include/linux/fs.h:2265 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x857/0xbc0 fs/read_write.c:584
 ksys_write+0x19c/0x2c0 fs/read_write.c:637
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fd7849784df
RSP: 002b:00007fd78573fdf0 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00000000013bd7ef RCX: 00007fd7849784df
RDX: 00000000013bd7ef RSI: 00007fd77a7f7000 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000000 R09: 00000000000054f5
R10: 00000000000003ca R11: 0000000000000293 R12: 0000000000000003
R13: 00007fd78573fef0 R14: 00007fd78573feb0 R15: 00007fd77a7f7000
 </TASK>
rcu: rcu_preempt kthread starved for 9570 jiffies! g47349 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:26144 pid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5241 [inline]
 __schedule+0x143f/0x4570 kernel/sched/core.c:6558
 schedule+0xbf/0x180 kernel/sched/core.c:6634
 schedule_timeout+0x1b9/0x300 kernel/time/timer.c:1965
 rcu_gp_fqs_loop+0x2d2/0x1150 kernel/rcu/tree.c:1706
 rcu_gp_kthread+0xa3/0x3b0 kernel/rcu/tree.c:1905
 kthread+0x28d/0x320 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
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:51 [inline]
NMI backtrace for cpu 0 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline]
NMI backtrace for cpu 0 skipped: idling at acpi_safe_halt drivers/acpi/processor_idle.c:111 [inline]
NMI backtrace for cpu 0 skipped: idling at acpi_idle_do_entry+0x10f/0x340 drivers/acpi/processor_idle.c:567

Crashes (18):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/08/12 14:45 linux-6.1.y 36790ef5e00b 842184b3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in generic_file_write_iter
2024/08/09 22:46 linux-6.1.y 48d525b0e463 a83d9288 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in generic_file_write_iter
2024/08/09 01:12 linux-6.1.y 48d525b0e463 61405512 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in generic_file_write_iter
2024/07/29 05:17 linux-6.1.y c1cec4dad96b 46eb10b7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in generic_file_write_iter
2024/07/21 11:16 linux-6.1.y 9b3f9a5b12dc b88348e9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf INFO: rcu detected stall in generic_file_write_iter
2024/07/04 05:48 linux-6.1.y 99e6a620de00 f76a75f3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in generic_file_write_iter
2024/07/02 01:21 linux-6.1.y 99e6a620de00 b294e901 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in generic_file_write_iter
2024/06/27 16:35 linux-6.1.y 99e6a620de00 6ef39602 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in generic_file_write_iter
2024/06/09 08:32 linux-6.1.y 88690811da69 82c05ab8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in generic_file_write_iter
2024/06/07 10:23 linux-6.1.y 88690811da69 121701b6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in generic_file_write_iter
2024/06/05 07:57 linux-6.1.y 88690811da69 e1e2c66e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in generic_file_write_iter
2024/06/01 00:15 linux-6.1.y 88690811da69 3113787f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in generic_file_write_iter
2024/05/27 12:43 linux-6.1.y 88690811da69 761766e6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in generic_file_write_iter
2024/05/25 08:52 linux-6.1.y 4078fa637fcd a10a183e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in generic_file_write_iter
2024/05/17 15:47 linux-6.1.y 4078fa637fcd a12e99e7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in generic_file_write_iter
2024/04/25 00:10 linux-6.1.y 6741e066ec76 8bdc0f22 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in generic_file_write_iter
2024/04/21 16:22 linux-6.1.y 6741e066ec76 af24b050 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in generic_file_write_iter
2024/05/22 13:49 linux-6.1.y 4078fa637fcd 4d098039 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 INFO: rcu detected stall in generic_file_write_iter
* Struck through repros no longer work on HEAD.