syzbot


INFO: rcu detected stall in ext4_file_write_iter

Status: auto-obsoleted due to no activity on 2024/02/29 20:44
Reported-by: syzbot+ff0df46d5a3087ce54ea@syzkaller.appspotmail.com
First crash: 101d, last: 101d
Similar bugs (11)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: rcu detected stall in ext4_file_write_iter (3) block 5 935d 1025d 0/26 auto-closed as invalid on 2021/11/07 19:52
upstream INFO: rcu detected stall in ext4_file_write_iter (5) mm 3 676d 676d 0/26 auto-closed as invalid on 2022/06/25 07:58
upstream INFO: rcu detected stall in ext4_file_write_iter (7) mm bpf ext4 3 183d 225d 23/26 fixed on 2023/10/12 12:47
upstream INFO: rcu detected stall in ext4_file_write_iter (4) mm C unreliable 58 771d 800d 0/26 closed as invalid on 2022/02/08 10:32
android-49 INFO: rcu detected stall in ext4_file_write_iter syz 2 1733d 1774d 0/3 public: reported syz repro on 2019/04/23 08:58
upstream INFO: rcu detected stall in ext4_file_write_iter (2) ext4 1 1236d 1236d 0/26 auto-closed as invalid on 2021/01/10 12:58
linux-4.14 INFO: rcu detected stall in ext4_file_write_iter C 7 376d 1785d 0/1 upstream: reported C repro on 2019/04/12 16:30
upstream INFO: rcu detected stall in ext4_file_write_iter C inconclusive done 93 1298d 1831d 15/26 fixed on 2020/09/25 01:17
linux-4.19 INFO: rcu detected stall in ext4_file_write_iter C error 9 436d 1777d 0/1 upstream: reported C repro on 2019/04/20 13:09
upstream INFO: rcu detected stall in ext4_file_write_iter (6) ext4 C error 8 324d 387d 22/26 fixed on 2023/06/08 14:41
linux-4.19 BUG: soft lockup in ext4_file_write_iter 1 981d 981d 0/1 auto-closed as invalid on 2021/10/22 22:26

Sample crash report:
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...0: (0 ticks this GP) idle=a4d/1/0x4000000000000000 softirq=215785/215785 fqs=2099 
	(detected by 0, t=10502 jiffies, g=273585, q=240)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 28093 Comm: syz-executor.1 Not tainted 5.15.139-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
RIP: 0010:kasan_mem_to_shadow include/linux/kasan.h:55 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:129 [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+0x4a/0x290 mm/kasan/generic.c:189
Code: 48 c1 ed 2f 81 fd ff ff 01 00 0f 82 46 02 00 00 48 89 fb 48 c1 eb 03 49 b8 00 00 00 00 00 fc ff df 4e 8d 0c 03 4c 8d 54 37 ff <49> c1 ea 03 49 bb 01 00 00 00 00 fc ff df 4f 8d 34 1a 4c 89 f5 4c
RSP: 0018:ffffc90000dd0a38 EFLAGS: 00000802
RAX: 0000000000000001 RBX: 1ffffffff1f79c20 RCX: ffffffff816290df
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8fbce100
RBP: 000000000001ffff R08: dffffc0000000000 R09: fffffbfff1f79c20
R10: ffffffff8fbce107 R11: dffffc0000000001 R12: 0000000000000004
R13: ffff88801c36c668 R14: 1ffff1100386d8e6 R15: ffff88801c36c730
FS:  00007f848e7f66c0(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020390000 CR3: 00000000998b2000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 instrument_atomic_read include/linux/instrumented.h:71 [inline]
 test_bit include/asm-generic/bitops/instrumented-non-atomic.h:134 [inline]
 __lock_acquire+0xcef/0x1ff0 kernel/locking/lockdep.c:4981
 lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5622
 rcu_lock_acquire+0x2a/0x30 include/linux/rcupdate.h:269
 rcu_read_lock include/linux/rcupdate.h:696 [inline]
 advance_sched+0x6ce/0x940 net/sched/sch_taprio.c:769
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x598/0xcf0 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x392/0x980 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1085 [inline]
 __sysvec_apic_timer_interrupt+0x139/0x470 arch/x86/kernel/apic/apic.c:1102
 sysvec_apic_timer_interrupt+0x8c/0xb0 arch/x86/kernel/apic/apic.c:1096
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:638
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+0x5c/0x290 mm/kasan/generic.c:189
Code: fb 48 c1 eb 03 49 b8 00 00 00 00 00 fc ff df 4e 8d 0c 03 4c 8d 54 37 ff 49 c1 ea 03 49 bb 01 00 00 00 00 fc ff df 4f 8d 34 1a <4c> 89 f5 4c 29 cd 48 83 fd 10 7f 26 48 85 ed 0f 84 3a 01 00 00 49
RSP: 0018:ffffc9000c23f798 EFLAGS: 00000a03
RAX: ffffffff81e53801 RBX: 1ffffd4000408a20 RCX: ffffffff81e53831
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffffea0002045100
RBP: 000000000001ffff R08: dffffc0000000000 R09: fffff94000408a20
R10: 1ffffd4000408a20 R11: dffffc0000000001 R12: 00fff00000002011
R13: dffffc0000000000 R14: fffff94000408a21 R15: ffffea0002045108
 instrument_atomic_read_write include/linux/instrumented.h:101 [inline]
 test_and_set_bit include/asm-generic/bitops/instrumented-atomic.h:70 [inline]
 TestSetPageDirty include/linux/page-flags.h:348 [inline]
 mark_buffer_dirty+0x271/0x4b0 fs/buffer.c:1105
 __block_commit_write+0x1db/0x310 fs/buffer.c:2085
 block_write_end fs/buffer.c:2164 [inline]
 generic_write_end+0xa7/0x440 fs/buffer.c:2178
 ext4_da_write_end+0x72d/0x9e0 fs/ext4/inode.c:3084
 generic_perform_write+0x3b7/0x5b0 mm/filemap.c:3787
 ext4_buffered_write_iter+0x227/0x360 fs/ext4/file.c:268
 ext4_file_write_iter+0x87c/0x1990
 call_write_iter include/linux/fs.h:2103 [inline]
 new_sync_write fs/read_write.c:507 [inline]
 vfs_write+0xacf/0xe50 fs/read_write.c:594
 ksys_write+0x1a2/0x2c0 fs/read_write.c:647
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f8490274ae9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 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 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f848e7f60c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f8490393f80 RCX: 00007f8490274ae9
RDX: 000000000208e24b RSI: 0000000020000000 RDI: 0000000000000003
RBP: 00007f84902c047a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f8490393f80 R15: 00007fff7db4a838
 </TASK>

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/11/21 20:44 linux-5.15.y 2a910f4af54d cb976f63 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: rcu detected stall in ext4_file_write_iter
* Struck through repros no longer work on HEAD.