INFO: rcu detected stall in generic_file_write_iter (2)

Status: upstream: reported on 2024/03/08 18:29
Reported-by: syzbot+bb21d42787b313521a4c@syzkaller.appspotmail.com
First crash: 961d, last: 6d20h
▶ ▼ Similar bugs (14)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 INFO: rcu detected stall in generic_file_write_iter (3) 1 6 27d 106d 0/3 upstream: reported on 2026/07/11 18:33
upstream INFO: rcu detected stall in generic_file_write_iter (3) mm 1 1 2517d 2517d 0/29 closed as invalid on 2019/12/04 14:04
upstream INFO: rcu detected stall in generic_file_write_iter (2) exfat 1 2 2732d 2771d 0/29 auto-closed as invalid on 2019/10/25 09:01
upstream BUG: soft lockup in generic_file_write_iter (2) mm 1 8 1203d 1191d 0/29 auto-obsoleted due to no activity on 2023/10/18 13:34
linux-6.1 INFO: rcu detected stall in generic_file_write_iter (2) 1 17 247d 675d 0/3 auto-obsoleted due to no activity on 2026/05/31 05:00
linux-5.15 INFO: rcu detected stall in generic_file_write_iter 1 1 1147d 1147d 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 1 2450d 2446d 0/29 auto-closed as invalid on 2020/05/09 11:43
upstream BUG: soft lockup in generic_file_write_iter net fs mm 1 2 1389d 1423d 0/29 auto-obsoleted due to no activity on 2023/04/05 19:12
upstream INFO: rcu detected stall in generic_file_write_iter mm 1 58 2795d 2938d 0/29 closed as dup on 2018/10/27 15:28
upstream INFO: rcu detected stall in generic_file_write_iter (5) fs 1 2 2284d 2291d 0/29 auto-closed as invalid on 2020/10/22 01:02
upstream INFO: rcu detected stall in generic_file_write_iter (7) block 1 1 469d 469d 0/29 auto-obsoleted due to no activity on 2025/10/11 00:51
upstream INFO: rcu detected stall in generic_file_write_iter (6) mm cgroups 1 2 1770d 1827d 0/29 closed as invalid on 2022/02/08 09:50
linux-6.1 INFO: rcu detected stall in generic_file_write_iter 1 18 804d 917d 0/3 auto-obsoleted due to no activity on 2024/11/12 08:46
android-5-15 BUG: soft lockup in generic_file_write_iter 1 1 896d 896d 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: 	0-....: (18 ticks this GP) idle=b01/1/0x4000000000000002 softirq=9030/9032 fqs=2101 
	(detected by 1, t=10506 jiffies, g=11181, q=1674)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 5361 Comm: syz.2.231 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
RIP: 0010:__perf_event_account_interrupt+0x47/0x280 kernel/events/core.c:9433
Code: e0 ff 48 c7 c7 c0 bb 32 8a e8 75 9b 29 08 65 4c 8b 3d 65 c3 6a 7e 4c 8d a3 00 02 00 00 4c 89 e5 48 c1 ed 03 42 80 7c 2d 00 00 <74> 08 4c 89 e7 e8 4f db 25 00 4d 8b 2c 24 4c 89 ff 4c 89 ee e8 20
RSP: 0018:ffffc90000007558 EFLAGS: 00000046
RAX: 0000000000000000 RBX: ffff88807a7d0bf0 RCX: 96b4aba1daa5ac00
RDX: 0000000000000100 RSI: ffffffff8a32bbc0 RDI: ffffffff8a7a4b40
RBP: 1ffff1100f4fa1be R08: ffff88807a7d1063 R09: 1ffff1100f4fa20c
R10: dffffc0000000000 R11: ffffed100f4fa20d R12: ffff88807a7d0df0
R13: dffffc0000000000 R14: 0000000000000000 R15: 00000000000027ff
FS:  00007f94551c76c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000306000 CR3: 000000001c3cd000 CR4: 00000000003506f0
DR0: 0000200000000d40 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 __perf_event_overflow+0x9a/0x550 kernel/events/core.c:9484
 perf_swevent_overflow kernel/events/core.c:9601 [inline]
 perf_swevent_event+0x4b8/0x540 kernel/events/core.c:9639
 perf_tp_event+0x324/0xbe0 kernel/events/core.c:10057
 perf_trace_run_bpf_submit+0xf3/0x1c0 kernel/events/core.c:10031
 perf_trace_preemptirq_template+0x2aa/0x360 include/trace/events/preemptirq.h:14
 trace_irq_enable_rcuidle+0x108/0x180 include/trace/events/preemptirq.h:40
 trace_hardirqs_on+0x57/0x80 kernel/trace/trace_preemptirq.c:44
 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:713
RIP: 0010:rcu_read_unlock_special+0x7f/0x4a0 kernel/rcu/tree_plugin.h:674
Code: eb 03 48 b8 f1 f1 f1 f1 f8 f2 f2 f2 4a 89 04 2b 42 c7 44 2b 08 f8 f3 f3 f3 65 44 8b 35 82 fc 9c 7e 41 f7 c6 00 00 f0 00 74 40 <48> c7 44 24 20 0e 36 e0 45 4a c7 04 2b 00 00 00 00 42 c7 44 2b 08
RSP: 0018:ffffc90000007b00 EFLAGS: 00000206
RAX: 96b4aba1daa5ac00 RBX: 1ffff92000000f64 RCX: 96b4aba1daa5ac00
RDX: dffffc0000000000 RSI: ffffffff8a2b2b60 RDI: ffffffff8a7a4b40
RBP: ffffc90000007bd8 R08: ffffffff9101515f R09: 1ffffffff2202a2b
R10: dffffc0000000000 R11: fffffbfff2202a2c R12: ffffffff8d123400
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001
 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:422
 rcu_read_unlock include/linux/rcupdate.h:772 [inline]
 ieee80211_iterate_active_interfaces_atomic+0x132/0x140 net/mac80211/util.c:831
 mac80211_hwsim_beacon+0x9b/0x180 drivers/net/wireless/mac80211_hwsim.c:1865
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x4ea/0xb60 kernel/time/hrtimer.c:1749
 hrtimer_run_softirq+0x176/0x240 kernel/time/hrtimer.c:1766
 handle_softirqs+0x336/0x830 kernel/softirq.c:576
 __do_softirq kernel/softirq.c:610 [inline]
 invoke_softirq kernel/softirq.c:450 [inline]
 __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:659
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:671
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:__schedule+0x121a/0x4350 kernel/sched/core.c:6403
Code: c7 44 20 08 00 00 00 00 65 48 8b 04 25 28 00 00 00 48 3b 84 24 80 01 00 00 0f 85 24 03 00 00 48 8d 65 d8 5b 41 5c 41 5d 41 5e <41> 5f 5d c3 49 8d bf c8 05 00 00 48 89 f8 48 c1 e8 03 48 ba 00 00
RSP: 0018:ffffc9000335f048 EFLAGS: 00000246
RAX: 96b4aba1daa5ac00 RBX: 0000000000000000 RCX: ffffffff81530e24
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffff88801f6a8760
RBP: ffffc9000335f050 R08: ffff88801f6a8763 R09: 1ffff11003ed50ec
R10: dffffc0000000000 R11: ffffed1003ed50ed R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: ffff8880629022d0
 preempt_schedule_irq+0xbb/0x160 kernel/sched/core.c:6799
 irqentry_exit+0x63/0x70 kernel/entry/common.c:435
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:__set_page_owner_handle mm/page_owner.c:159 [inline]
RIP: 0010:__set_page_owner+0xc1/0x2d0 mm/page_owner.c:182
Code: 95 63 b4 ff 41 83 ef 01 0f 82 03 02 00 00 e8 86 63 b4 ff 4c 8b 2d df ab 5b 0b 4b 8d 7c 2e 08 48 89 f8 48 c1 e8 03 0f b6 04 18 <84> c0 0f 85 39 01 00 00 4d 01 f5 8b 04 24 41 89 45 08 4c 89 e8 48
RSP: 0018:ffffc9000335f1d0 EFLAGS: 00000a06
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffff888062901dc0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff888019895e30
RBP: 0000000000000000 R08: 000000000000000d R09: ffffffff89e000ca
R10: 0000000000000002 R11: 00000000a292a673 R12: 0000000001100cca
R13: 0000000000000008 R14: ffff888019895e20 R15: 0000000000000000
 prep_new_page mm/page_alloc.c:2426 [inline]
 get_page_from_freelist+0x24f6/0x2670 mm/page_alloc.c:4192
 __alloc_pages+0x1ee/0x480 mm/page_alloc.c:5501
 alloc_pages_vma+0x2bc/0x790 mm/mempolicy.c:2146
 shmem_alloc_page mm/shmem.c:1586 [inline]
 shmem_alloc_and_acct_page+0x47f/0xbe0 mm/shmem.c:1611
 shmem_getpage_gfp+0x14be/0x2c10 mm/shmem.c:1906
 shmem_getpage mm/shmem.c:151 [inline]
 shmem_write_begin+0xcd/0x1a0 mm/shmem.c:2474
 generic_perform_write+0x2b6/0x550 mm/filemap.c:3785
 __generic_file_write_iter+0x261/0x4e0 mm/filemap.c:3912
 generic_file_write_iter+0xa6/0x1b0 mm/filemap.c:3944
 call_write_iter include/linux/fs.h:2179 [inline]
 new_sync_write fs/read_write.c:507 [inline]
 vfs_write+0x748/0xd70 fs/read_write.c:594
 ksys_write+0x153/0x260 fs/read_write.c:647
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f9456f6f559
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f94551c7028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f94571f6fa0 RCX: 00007f9456f6f559
RDX: 0000000013bb711e RSI: 0000200000000a80 RDI: 0000000000000006
RBP: 00007f9457006ab8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f94571f7038 R14: 00007f94571f6fa0 R15: 00007ffd789ea968
 </TASK>

Crashes (44):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/10/19 00:43 linux-5.15.y 792fbe1537d8 432c0077 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf INFO: rcu detected stall in generic_file_write_iter
2026/09/06 20:27 linux-5.15.y 0996e0926f6b 4f7b22a0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf INFO: rcu detected stall in generic_file_write_iter
2026/09/01 09:38 linux-5.15.y 28c35638ec51 316d9396 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: rcu detected stall in generic_file_write_iter
2026/08/29 14:34 linux-5.15.y 28c35638ec51 2f52988a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf INFO: rcu detected stall in generic_file_write_iter
2026/08/20 07:20 linux-5.15.y 0eb903b5b519 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf INFO: rcu detected stall in generic_file_write_iter
2026/06/08 23:14 linux-5.15.y dc027a595035 656e94c6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf INFO: rcu detected stall in generic_file_write_iter
2026/03/30 06:09 linux-5.15.y 91d48252ad4b b5ceaad2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: rcu detected stall in generic_file_write_iter
2026/02/10 10:28 linux-5.15.y 7b232985052f 4ab09a02 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: rcu detected stall in generic_file_write_iter
2026/02/09 17:09 linux-5.15.y 7b232985052f df949cd9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: rcu detected stall in generic_file_write_iter
2026/01/13 04:23 linux-5.15.y 68efe5a6c16a d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: rcu detected stall in generic_file_write_iter
2025/12/23 21:41 linux-5.15.y 68efe5a6c16a d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: rcu detected stall in generic_file_write_iter
2025/12/20 01:01 linux-5.15.y 68efe5a6c16a d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: rcu detected stall in generic_file_write_iter
2025/12/03 13:08 linux-5.15.y cc5ec8769306 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: rcu detected stall in generic_file_write_iter
2025/11/10 14:27 linux-5.15.y cc5ec8769306 4e1406b4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: rcu detected stall in generic_file_write_iter
2025/11/03 17:59 linux-5.15.y cc5ec8769306 2c50b6a9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: rcu detected stall in generic_file_write_iter
2025/11/02 05:02 linux-5.15.y cc5ec8769306 2c50b6a9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: rcu detected stall in generic_file_write_iter
2025/08/17 10:48 linux-5.15.y c79648372d02 1804e95e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf INFO: rcu detected stall in generic_file_write_iter
2025/08/14 23:36 linux-5.15.y c79648372d02 5d8c2ac2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: rcu detected stall in generic_file_write_iter
2025/08/12 10:31 linux-5.15.y c79648372d02 c06e8995 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf INFO: rcu detected stall in generic_file_write_iter
2025/07/17 15:48 linux-5.15.y 89950c454265 0d1223f1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: rcu detected stall in generic_file_write_iter
2025/04/21 19:41 linux-5.15.y f7347f400572 2a20f901 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: rcu detected stall in generic_file_write_iter
2025/03/19 01:25 linux-5.15.y 0c935c049b5c 22a6c2b1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: rcu detected stall in generic_file_write_iter
2025/02/07 09:54 linux-5.15.y c16c81c81336 53657d1b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: rcu detected stall in generic_file_write_iter
2025/01/05 20:37 linux-5.15.y 91786f140358 f3558dbf .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: rcu detected stall in generic_file_write_iter
2024/11/25 11:35 linux-5.15.y 0a51d2d4527b 68da6d95 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: rcu detected stall in generic_file_write_iter
2024/10/04 02:05 linux-5.15.y 3a5928702e71 d7906eff .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: rcu detected stall in generic_file_write_iter
2024/10/01 02:03 linux-5.15.y 3a5928702e71 bbd4e0a4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: rcu detected stall in generic_file_write_iter
2024/09/25 05:30 linux-5.15.y 3a5928702e71 5643e0e9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: rcu detected stall in generic_file_write_iter
2024/09/25 05:25 linux-5.15.y 3a5928702e71 5643e0e9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: rcu detected stall in generic_file_write_iter
2024/08/25 12:46 linux-5.15.y fa93fa65db6e d7d32352 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: rcu detected stall in generic_file_write_iter
2024/08/23 15:54 linux-5.15.y fa93fa65db6e d7d32352 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: rcu detected stall in generic_file_write_iter
2024/08/14 05:45 linux-5.15.y 7e89efd3ae1c bde81f6f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: rcu detected stall in generic_file_write_iter
2024/08/11 14:11 linux-5.15.y 7e89efd3ae1c 6f4edef4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: rcu detected stall in generic_file_write_iter
2024/08/06 05:48 linux-5.15.y 7e89efd3ae1c e1bdb00a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: rcu detected stall in generic_file_write_iter
2024/07/02 15:21 linux-5.15.y 4878aadf2d15 07f0a0a0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: rcu detected stall in generic_file_write_iter
2024/06/26 23:11 linux-5.15.y 4878aadf2d15 c6d33a01 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: rcu detected stall in generic_file_write_iter
2024/06/20 01:11 linux-5.15.y 4878aadf2d15 41b7e219 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: rcu detected stall in generic_file_write_iter
2024/06/19 05:21 linux-5.15.y 4878aadf2d15 41b7e219 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: rcu detected stall in generic_file_write_iter
2024/06/19 01:58 linux-5.15.y 4878aadf2d15 639d6cdf .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: rcu detected stall in generic_file_write_iter
2024/05/24 04:21 linux-5.15.y 83655231580b 8f98448e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: rcu detected stall in generic_file_write_iter
2024/04/30 16:34 linux-5.15.y b925f60c6ee7 3ce4924c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: rcu detected stall in generic_file_write_iter
2024/04/26 10:25 linux-5.15.y c52b9710c83d 8bdc0f22 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: rcu detected stall in generic_file_write_iter
2024/03/08 18:28 linux-5.15.y 574362648507 8e75c913 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: rcu detected stall in generic_file_write_iter
2024/08/29 09:14 linux-5.15.y fa93fa65db6e ef3de9e8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 INFO: rcu detected stall in generic_file_write_iter
* Struck through repros no longer work on HEAD.