INFO: rcu detected stall in generic_file_read

Kernel	Title	Rank 🛈	Repro	Fix bisect	Count	Last	Reported	Patched	Status
linux-4.14	INFO: rcu detected stall in generic_file_read_iter	1	C	error	1	1913d	1913d	0/1	upstream: reported C repro on 2020/11/06 19:48
linux-6.1	INFO: rcu detected stall in generic_file_read_iter	1			1	107d	107d	0/3	auto-obsoleted due to no activity on 2026/01/25 15:32
linux-6.1	INFO: rcu detected stall in generic_file_read_iter (2)	1			1	2d10h	2d10h	0/3	upstream: reported on 2026/01/30 21:20

MINIX-fs: mounting unchecked file system, running fsck is recommended MINIX-fs: mounting unchecked file system, running fsck is recommended hrtimer: interrupt took 223516 ns MINIX-fs: mounting unchecked file system, running fsck is recommended rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: (detected by 1, t=10502 jiffies, g=5293, q=39) rcu: All QSes seen, last rcu_preempt kthread activity 10503 (4295020416-4295009913), jiffies_till_next_fqs=1, root ->qsmask 0x0 syz-executor456 R running task 24608 8112 8111 0x80000000 Call Trace: <IRQ> sched_show_task.cold+0x332/0x396 kernel/sched/core.c:5341 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+0xb37/0xe19 kernel/rcu/tree.c:2682 update_process_times+0x2a/0xb0 kernel/time/timer.c:1650 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:168 tick_sched_timer+0xfc/0x290 kernel/time/tick-sched.c:1278 __run_hrtimer kernel/time/hrtimer.c:1401 [inline] __hrtimer_run_queues+0x3f6/0xe60 kernel/time/hrtimer.c:1463 hrtimer_interrupt+0x32a/0x930 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:894 </IRQ> RIP: 0010:orc_find arch/x86/kernel/unwind_orc.c:149 [inline] RIP: 0010:unwind_next_frame+0x23f/0x1c60 arch/x86/kernel/unwind_orc.c:422 Code: 00 00 fc ff df 41 89 f0 4a 8d 3c 85 2c 01 17 8c 49 89 f9 49 c1 e9 03 45 0f b6 0c 11 48 89 fa 83 e2 07 83 c2 03 44 38 ca 7c 32 <45> 84 c9 74 2d 4c 89 44 24 30 48 89 74 24 28 44 89 54 24 20 48 89 RSP: 0018:ffff8880b05869e0 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000000 RBX: 1ffff110160b0d44 RCX: ffffffff817f965b RDX: 0000000000000007 RSI: 0000000000007f96 RDI: ffffffff8c18ff84 RBP: 0000000000000001 R08: 0000000000007f96 R09: 0000000000000000 R10: 0000000000074071 R11: 0000000000000001 R12: ffff8880b0586b10 R13: ffff8880b0586afd R14: ffff8880b0586b00 R15: ffff8880b0586ac8 __save_stack_trace+0x9f/0x190 arch/x86/kernel/stacktrace.c:44 save_stack mm/kasan/kasan.c:448 [inline] set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:553 kmem_cache_alloc+0x122/0x370 mm/slab.c:3559 kmem_cache_zalloc include/linux/slab.h:699 [inline] alloc_buffer_head+0x20/0x130 fs/buffer.c:3372 alloc_page_buffers+0x169/0x5c0 fs/buffer.c:830 create_empty_buffers+0x2c/0x760 fs/buffer.c:1528 create_page_buffers+0x212/0x350 fs/buffer.c:1645 block_read_full_page+0xcf/0xd10 fs/buffer.c:2239 read_pages.isra.0+0x329/0x5d0 mm/readahead.c:133 __do_page_cache_readahead+0x5c6/0x6c0 mm/readahead.c:211 ra_submit mm/internal.h:66 [inline] ondemand_readahead.isra.0+0x575/0xd40 mm/readahead.c:493 page_cache_async_readahead mm/readahead.c:575 [inline] page_cache_async_readahead+0x406/0x750 mm/readahead.c:548 generic_file_buffered_read mm/filemap.c:2123 [inline] generic_file_read_iter+0x16ac/0x2b60 mm/filemap.c:2385 call_read_iter include/linux/fs.h:1815 [inline] new_sync_read fs/read_write.c:406 [inline] __vfs_read+0x518/0x750 fs/read_write.c:418 integrity_kernel_read+0x147/0x1f0 security/integrity/iint.c:200 ima_calc_file_hash_tfm security/integrity/ima/ima_crypto.c:364 [inline] ima_calc_file_shash security/integrity/ima/ima_crypto.c:393 [inline] ima_calc_file_hash+0x512/0x990 security/integrity/ima/ima_crypto.c:458 ima_collect_measurement+0x4c4/0x570 security/integrity/ima/ima_api.c:231 process_measurement+0xddd/0x1440 security/integrity/ima/ima_main.c:284 ima_file_check+0xb9/0x100 security/integrity/ima/ima_main.c:391 do_last fs/namei.c:3425 [inline] path_openat+0x7e4/0x2df0 fs/namei.c:3537 do_filp_open+0x18c/0x3f0 fs/namei.c:3567 do_sys_open+0x3b3/0x520 fs/open.c:1085 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x445aa9 Code: 6d cb 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 3b cb fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffdc5896f48 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000445aa9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000200000c0 RBP: 0000000000000004 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004 R13: 0000000000000003 R14: 0000000000000003 R15: 0000000000000004 rcu: rcu_preempt kthread starved for 10575 jiffies! g5293 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 rcu: RCU grace-period kthread stack dump: rcu_preempt R running task 29208 10 2 0x80000000 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 schedule+0x8d/0x1b0 kernel/sched/core.c:3561 schedule_timeout+0x4cf/0xfe0 kernel/time/timer.c:1825 rcu_gp_kthread+0xdad/0x21c0 kernel/rcu/tree.c:2202 kthread+0x33f/0x460 kernel/kthread.c:259 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	Manager
2020/11/18 12:28	linux-4.19.y	31acccdc8774	09323409	.config	console log	report	syz	C		ci2-linux-4-19
2020/10/22 17:31	linux-4.19.y	ad326970d25c	be6b1582	.config	console log	report	syz	C		ci2-linux-4-19
2020/10/22 13:11	linux-4.19.y	ad326970d25c	be6b1582	.config	console log	report			info	ci2-linux-4-19

Crashes (3):

Assets (help?)