syzbot


INFO: rcu detected stall in sys_open (4)

Status: auto-closed as invalid on 2022/06/24 20:08
Reported-by: syzbot+@syzkaller.appspotmail.com
First crash: 226d, last: 226d
similar bugs (4):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: rcu detected stall in sys_open 1 1296d 1296d 0/24 auto-closed as invalid on 2019/10/25 09:11
linux-4.19 INFO: rcu detected stall in sys_open 1 1183d 1183d 0/1 auto-closed as invalid on 2020/01/09 20:01
upstream INFO: rcu detected stall in sys_open (3) C inconclusive 5 333d 569d 0/24 closed as invalid on 2022/02/08 10:35
upstream INFO: rcu detected stall in sys_open (2) C done done 42 757d 1108d 17/24 fixed on 2020/12/23 11:40

Sample crash report:
rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-...!: (10499 ticks this GP) idle=591/1/0x4000000000000000 softirq=8184/8184 fqs=0 
	(t=10500 jiffies g=9021 q=3 ncpus=2)
rcu: rcu_preempt kthread timer wakeup didn't happen for 10499 jiffies! g9021 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=3163
rcu: rcu_preempt kthread starved for 10500 jiffies! g9021 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1
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:I stack:28680 pid:   16 ppid:     2 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5106 [inline]
 __schedule+0xa9a/0x4cc0 kernel/sched/core.c:6421
 schedule+0xd2/0x1f0 kernel/sched/core.c:6493
 schedule_timeout+0x14a/0x2a0 kernel/time/timer.c:1907
 rcu_gp_fqs_loop+0x1c0/0x840 kernel/rcu/tree.c:2078
 rcu_gp_kthread+0x1de/0x320 kernel/rcu/tree.c:2267
 kthread+0x2e9/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 4473 Comm: syz-executor.3 Not tainted 5.18.0-rc3-next-20220422-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:kvm_wait+0x98/0x100 arch/x86/kernel/kvm.c:1058
Code: fa 83 e2 07 38 d0 7f 04 84 c0 75 63 0f b6 07 40 38 c6 74 35 48 83 c4 10 c3 c3 e8 23 91 4b 00 eb 07 0f 00 2d da b1 94 08 fb f4 <48> 83 c4 10 c3 89 74 24 0c 48 89 3c 24 e8 56 8f 4b 00 8b 74 24 0c
RSP: 0018:ffffc90000de0488 EFLAGS: 00000246
RAX: 0000000000000007 RBX: 0000000000000000 RCX: 1ffffffff1b73199
RDX: 0000000000000000 RSI: ffffffff81807171 RDI: ffffffff8134dffd
RBP: ffff88802295e1c8 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff81807158 R11: 0000000000000001 R12: 0000000000000000
R13: ffffed100452bc39 R14: 0000000000000001 R15: ffff8880b9d3ae40
FS:  00007fabee5fe700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2ca43000 CR3: 0000000051c4c000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 pv_wait arch/x86/include/asm/paravirt.h:603 [inline]
 pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:470 [inline]
 __pv_queued_spin_lock_slowpath+0x8c7/0xb50 kernel/locking/qspinlock.c:511
 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:591 [inline]
 queued_spin_lock_slowpath arch/x86/include/asm/qspinlock.h:51 [inline]
 queued_spin_lock include/asm-generic/qspinlock.h:85 [inline]
 do_raw_spin_lock+0x200/0x2a0 kernel/locking/spinlock_debug.c:115
 spin_lock include/linux/spinlock.h:354 [inline]
 task_lock include/linux/sched/task.h:170 [inline]
 __get_task_comm+0x23/0x50 fs/exec.c:1219
 __set_page_owner_handle mm/page_owner.c:174 [inline]
 __set_page_owner+0x253/0x380 mm/page_owner.c:192
 prep_new_page mm/page_alloc.c:2394 [inline]
 get_page_from_freelist+0xba2/0x3e00 mm/page_alloc.c:4135
 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5356
 alloc_pages+0x1aa/0x310 mm/mempolicy.c:2273
 alloc_slab_page mm/slub.c:1797 [inline]
 allocate_slab+0x26c/0x3c0 mm/slub.c:1942
 new_slab mm/slub.c:2002 [inline]
 ___slab_alloc+0x985/0xd90 mm/slub.c:3002
 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3089
 slab_alloc_node mm/slub.c:3180 [inline]
 kmem_cache_alloc_node+0x122/0x3f0 mm/slub.c:3264
 __alloc_skb+0x215/0x340 net/core/skbuff.c:414
 skb_copy+0x139/0x3c0 net/core/skbuff.c:1585
 mac80211_hwsim_tx_frame_no_nl.isra.0+0xb7c/0x13b0 drivers/net/wireless/mac80211_hwsim.c:1642
 mac80211_hwsim_tx_frame+0x1ee/0x2a0 drivers/net/wireless/mac80211_hwsim.c:1884
 mac80211_hwsim_beacon_tx+0x49e/0x920 drivers/net/wireless/mac80211_hwsim.c:1938
 __iterate_interfaces+0x1e5/0x560 net/mac80211/util.c:793
 ieee80211_iterate_active_interfaces_atomic+0x70/0x180 net/mac80211/util.c:829
 mac80211_hwsim_beacon+0xcd/0x1c0 drivers/net/wireless/mac80211_hwsim.c:1961
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x609/0xe50 kernel/time/hrtimer.c:1749
 hrtimer_run_softirq+0x17b/0x360 kernel/time/hrtimer.c:1766
 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558
 invoke_softirq kernel/softirq.c:432 [inline]
 __irq_exit_rcu+0x123/0x180 kernel/softirq.c:637
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:649
 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1106
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:649
RIP: 0010:memset_erms+0xb/0x10 arch/x86/lib/memset_64.S:65
Code: 03 40 0f b6 f6 48 b8 01 01 01 01 01 01 01 01 48 0f af c6 f3 48 ab 89 d1 f3 aa 4c 89 c8 c3 90 49 89 f9 40 88 f0 48 89 d1 f3 aa <4c> 89 c8 c3 90 49 89 fa 40 0f b6 ce 48 b8 01 01 01 01 01 01 01 01
RSP: 0018:ffffc9000499e890 EFLAGS: 00000202
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000000
RDX: 0000000000000001 RSI: 0000000000000000 RDI: ffff888012febbb8
RBP: ffff888012febba8 R08: 0000000000000001 R09: ffff888012febbb7
R10: ffffed10025fd776 R11: 0000000000000001 R12: 000000000000000e
R13: 0000000000000010 R14: ffff888012febb88 R15: 0000000000000007
 strscpy_pad+0x62/0x70 lib/string_helpers.c:792
 __get_task_comm+0x35/0x50 fs/exec.c:1221
 __set_page_owner_handle mm/page_owner.c:174 [inline]
 __set_page_owner+0x253/0x380 mm/page_owner.c:192
 prep_new_page mm/page_alloc.c:2394 [inline]
 get_page_from_freelist+0xba2/0x3e00 mm/page_alloc.c:4135
 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5356
 alloc_pages+0x1aa/0x310 mm/mempolicy.c:2273
 folio_alloc+0x1c/0x70 mm/mempolicy.c:2283
 filemap_alloc_folio+0x8e/0xb0 mm/filemap.c:996
 page_cache_ra_unbounded+0x1af/0x550 mm/readahead.c:240
 do_page_cache_ra mm/readahead.c:291 [inline]
 page_cache_ra_order+0x67a/0x940 mm/readahead.c:545
 ondemand_readahead+0x7d7/0x11c0 mm/readahead.c:665
 page_cache_async_ra mm/readahead.c:714 [inline]
 page_cache_async_ra+0x113/0x140 mm/readahead.c:696
 filemap_readahead mm/filemap.c:2568 [inline]
 filemap_get_pages+0x6c6/0x17c0 mm/filemap.c:2608
 filemap_read+0x325/0xc70 mm/filemap.c:2679
 generic_file_read_iter+0x3b0/0x5a0 mm/filemap.c:2825
 ext4_file_read_iter+0x1d7/0x600 fs/ext4/file.c:132
 __kernel_read+0x4e1/0xa30 fs/read_write.c:440
 integrity_kernel_read+0x7b/0xb0 security/integrity/iint.c:199
 ima_calc_file_hash_tfm+0x2aa/0x3b0 security/integrity/ima/ima_crypto.c:484
 ima_calc_file_shash security/integrity/ima/ima_crypto.c:515 [inline]
 ima_calc_file_hash+0x191/0x4a0 security/integrity/ima/ima_crypto.c:572
 ima_collect_measurement+0x4c3/0x570 security/integrity/ima/ima_api.c:252
 process_measurement+0xd2b/0x1910 security/integrity/ima/ima_main.c:337
 ima_file_check+0xac/0x100 security/integrity/ima/ima_main.c:517
 do_open fs/namei.c:3471 [inline]
 path_openat+0x161a/0x2910 fs/namei.c:3602
 do_filp_open+0x1aa/0x400 fs/namei.c:3629
 do_sys_openat2+0x16d/0x4c0 fs/open.c:1212
 do_sys_open fs/open.c:1228 [inline]
 __do_sys_open fs/open.c:1236 [inline]
 __se_sys_open fs/open.c:1232 [inline]
 __x64_sys_open+0x119/0x1c0 fs/open.c:1232
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7fabef6890e9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fabee5fe168 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00007fabef79c030 RCX: 00007fabef6890e9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000400
RBP: 00007fabef6e308d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc001f612f R14: 00007fabee5fe300 R15: 0000000000022000
 </TASK>
NMI backtrace for cpu 0
CPU: 0 PID: 4482 Comm: syz-executor.5 Not tainted 5.18.0-rc3-next-20220422-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x1e6/0x230 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x262/0x3f0 kernel/rcu/tree_stall.h:369
 print_cpu_stall kernel/rcu/tree_stall.h:665 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:749 [inline]
 rcu_pending kernel/rcu/tree.c:4068 [inline]
 rcu_sched_clock_irq.cold+0x144/0x8fc kernel/rcu/tree.c:2755
 update_process_times+0x16d/0x200 kernel/time/timer.c:1811
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:243
 tick_sched_timer+0xee/0x120 kernel/time/tick-sched.c:1473
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x1c0/0xe50 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1095 [inline]
 __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1112
 sysvec_apic_timer_interrupt+0x40/0xc0 arch/x86/kernel/apic/apic.c:1106
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:649
RIP: 0010:kvm_wait+0x98/0x100 arch/x86/kernel/kvm.c:1058
Code: fa 83 e2 07 38 d0 7f 04 84 c0 75 63 0f b6 07 40 38 c6 74 35 48 83 c4 10 c3 c3 e8 23 91 4b 00 eb 07 0f 00 2d da b1 94 08 fb f4 <48> 83 c4 10 c3 89 74 24 0c 48 89 3c 24 e8 56 8f 4b 00 8b 74 24 0c
RSP: 0018:ffffc90000007a20 EFLAGS: 00000246
RAX: 0000000000000007 RBX: 0000000000000000 RCX: 1ffffffff1b73199
RDX: 0000000000000000 RSI: ffffffff81807171 RDI: ffffffff8134dffd
RBP: ffffffff8cbfc980 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff81807158 R11: 0000000000000080 R12: 0000000000000000
R13: fffffbfff197f930 R14: 0000000000000001 R15: ffff8880b9c3ae40
 pv_wait arch/x86/include/asm/paravirt.h:603 [inline]
 pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:470 [inline]
 __pv_queued_spin_lock_slowpath+0x8c7/0xb50 kernel/locking/qspinlock.c:511
 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:591 [inline]
 queued_spin_lock_slowpath arch/x86/include/asm/qspinlock.h:51 [inline]
 queued_spin_lock include/asm-generic/qspinlock.h:85 [inline]
 do_raw_spin_lock+0x200/0x2a0 kernel/locking/spinlock_debug.c:115
 spin_lock include/linux/spinlock.h:354 [inline]
 mac80211_hwsim_tx_frame_no_nl.isra.0+0x6f4/0x13b0 drivers/net/wireless/mac80211_hwsim.c:1593
 mac80211_hwsim_tx_frame+0x1ee/0x2a0 drivers/net/wireless/mac80211_hwsim.c:1884
 mac80211_hwsim_beacon_tx+0x49e/0x920 drivers/net/wireless/mac80211_hwsim.c:1938
 __iterate_interfaces+0x1e5/0x560 net/mac80211/util.c:793
 ieee80211_iterate_active_interfaces_atomic+0x70/0x180 net/mac80211/util.c:829
 mac80211_hwsim_beacon+0xcd/0x1c0 drivers/net/wireless/mac80211_hwsim.c:1961
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x609/0xe50 kernel/time/hrtimer.c:1749
 hrtimer_run_softirq+0x17b/0x360 kernel/time/hrtimer.c:1766
 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558
 invoke_softirq kernel/softirq.c:432 [inline]
 __irq_exit_rcu+0x123/0x180 kernel/softirq.c:637
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:649
 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1106
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:649
RIP: 0010:pfn_to_bitidx mm/page_alloc.c:469 [inline]
RIP: 0010:__get_pfnblock_flags_mask mm/page_alloc.c:482 [inline]
RIP: 0010:get_pfnblock_migratetype mm/page_alloc.c:507 [inline]
RIP: 0010:free_unref_page_prepare mm/page_alloc.c:3284 [inline]
RIP: 0010:free_unref_page_prepare mm/page_alloc.c:3276 [inline]
RIP: 0010:free_unref_page+0xe3/0x6a0 mm/page_alloc.c:3376
Code: 05 48 01 c3 48 8d 7b 08 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 c4 04 00 00 4c 89 f0 48 8b 53 08 <48> c1 e8 09 83 e0 3f c1 e0 02 89 c1 48 c1 e8 03 83 e0 18 83 e1 3f
RSP: 0018:ffffc900049df920 EFLAGS: 00000246
RAX: 00000000000247a6 RBX: ffff88813fff9080 RCX: 0000000000000000
RDX: ffff88813fff8ba0 RSI: 00000000000000ff RDI: ffff88813fff9088
RBP: ffff88823ffef000 R08: 0000000000000000 R09: ffffed10048f4c00
R10: ffffffff81807158 R11: 000000000000001f R12: ffffea000091e980
R13: 0000000000000000 R14: 00000000000247a6 R15: ffff888022bcc208
 __put_single_page mm/swap.c:106 [inline]
 __put_page+0x145/0x280 mm/swap.c:129
 folio_put include/linux/mm.h:1200 [inline]
 put_page include/linux/mm.h:1233 [inline]
 generic_pipe_buf_release+0x23a/0x2b0 fs/pipe.c:210
 pipe_buf_release include/linux/pipe_fs_i.h:203 [inline]
 iter_file_splice_write+0x883/0xc70 fs/splice.c:704
 do_splice_from fs/splice.c:767 [inline]
 direct_splice_actor+0x110/0x180 fs/splice.c:936
 splice_direct_to_actor+0x34b/0x8c0 fs/splice.c:891
 do_splice_direct+0x1a7/0x270 fs/splice.c:979
 do_sendfile+0xae0/0x1240 fs/read_write.c:1246
 __do_sys_sendfile64 fs/read_write.c:1311 [inline]
 __se_sys_sendfile64 fs/read_write.c:1297 [inline]
 __x64_sys_sendfile64+0x1cc/0x210 fs/read_write.c:1297
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f8d350890e9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f8d36106168 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007f8d3519bf60 RCX: 00007f8d350890e9
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000004
RBP: 00007f8d350e308d R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffdffa R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffec148342f R14: 00007f8d36106300 R15: 0000000000022000
 </TASK>
----------------
Code disassembly (best guess):
   0:	fa                   	cli
   1:	83 e2 07             	and    $0x7,%edx
   4:	38 d0                	cmp    %dl,%al
   6:	7f 04                	jg     0xc
   8:	84 c0                	test   %al,%al
   a:	75 63                	jne    0x6f
   c:	0f b6 07             	movzbl (%rdi),%eax
   f:	40 38 c6             	cmp    %al,%sil
  12:	74 35                	je     0x49
  14:	48 83 c4 10          	add    $0x10,%rsp
  18:	c3                   	retq
  19:	c3                   	retq
  1a:	e8 23 91 4b 00       	callq  0x4b9142
  1f:	eb 07                	jmp    0x28
  21:	0f 00 2d da b1 94 08 	verw   0x894b1da(%rip)        # 0x894b202
  28:	fb                   	sti
  29:	f4                   	hlt
* 2a:	48 83 c4 10          	add    $0x10,%rsp <-- trapping instruction
  2e:	c3                   	retq
  2f:	89 74 24 0c          	mov    %esi,0xc(%rsp)
  33:	48 89 3c 24          	mov    %rdi,(%rsp)
  37:	e8 56 8f 4b 00       	callq  0x4b8f92
  3c:	8b 74 24 0c          	mov    0xc(%rsp),%esi

Crashes (1):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-linux-next-kasan-gce-root 2022/04/25 20:06 linux-next e7d6987e09a3 152baedd .config log report info INFO: rcu detected stall in sys_open
* Struck through repros no longer work on HEAD.