syzbot


INFO: rcu detected stall in nsim_dev_psample_report_work

Status: auto-obsoleted due to no activity on 2025/11/02 18:58
Subsystems: mm
[Documentation on labels]
First crash: 158d, last: 158d

Sample crash report:
bridge0: received packet on veth0_to_bridge with own address as source address (addr:e2:18:63:3e:5d:d4, vlan:0)
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P5939/1:b..l P55/1:b..l
rcu: 	(detected by 1, t=10503 jiffies, g=157613, q=574 ncpus=2)
task:kworker/0:2     state:R  running task     stack:25128 pid:55    tgid:55    ppid:2      task_flags:0x4208060 flags:0x00004000
Workqueue: events nsim_dev_psample_report_work
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5357 [inline]
 __schedule+0x1190/0x5de0 kernel/sched/core.c:6961
 preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7288
 irqentry_exit+0x36/0x90 kernel/entry/common.c:197
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x70 kernel/kcov.c:210
Code: 86 c7 54 00 48 89 df 5b e9 0d 50 5a 00 be 03 00 00 00 5b e9 f2 01 24 03 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 48 8b 34 24 65 48 8b 15 f8 c0 19 12 65 8b 05 09 c1 19
RSP: 0018:ffffc9000130f7d0 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 000000000003a8b0 RCX: ffffffff822c3408
RDX: ffff888023e85a00 RSI: 000000000000001f RDI: 0000000000000005
RBP: 0000000000000000 R08: 0000000000000005 R09: 000000000000001f
R10: 0000000000000002 R11: 0000000000000000 R12: ffff88801d8cb700
R13: 0000000000000004 R14: 0000000000000002 R15: dffffc0000000000
 __page_table_check_zero+0x1f7/0x5d0 mm/page_table_check.c:139
 page_table_check_free include/linux/page_table_check.h:43 [inline]
 free_pages_prepare mm/page_alloc.c:1396 [inline]
 __free_frozen_pages+0x7b7/0x10f0 mm/page_alloc.c:2895
 discard_slab mm/slub.c:2753 [inline]
 __put_partials+0x165/0x1c0 mm/slub.c:3218
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x4d/0x120 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x195/0x1e0 mm/kasan/quarantine.c:286
 __kasan_kmalloc+0x8a/0xb0 mm/kasan/common.c:385
 kasan_kmalloc include/linux/kasan.h:260 [inline]
 __do_kmalloc_node mm/slub.c:4365 [inline]
 __kmalloc_node_track_caller_noprof+0x221/0x510 mm/slub.c:4384
 kmalloc_reserve+0xef/0x2c0 net/core/skbuff.c:600
 __alloc_skb+0x166/0x380 net/core/skbuff.c:669
 alloc_skb include/linux/skbuff.h:1336 [inline]
 nsim_dev_psample_skb_build drivers/net/netdevsim/psample.c:46 [inline]
 nsim_dev_psample_report_work+0xa4/0xc80 drivers/net/netdevsim/psample.c:120
 process_one_work+0x9cc/0x1b70 kernel/workqueue.c:3236
 process_scheduled_works kernel/workqueue.c:3319 [inline]
 worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400
 kthread+0x3c5/0x780 kernel/kthread.c:463
 ret_from_fork+0x5d4/0x6f0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
task:kworker/0:6     state:R  running task     stack:25336 pid:5939  tgid:5939  ppid:2      task_flags:0x4208060 flags:0x00004000
Workqueue:  0x0 (wg-crypt-wg1)
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5357 [inline]
 __schedule+0x1190/0x5de0 kernel/sched/core.c:6961
 preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7288
 irqentry_exit+0x36/0x90 kernel/entry/common.c:197
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:27 [inline]
RIP: 0010:check_kcov_mode kernel/kcov.c:183 [inline]
RIP: 0010:write_comp_data+0x11/0x90 kernel/kcov.c:246
Code: cc cc 0f 1f 80 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 49 89 d2 49 89 f8 49 89 f1 65 48 8b 15 77 c7 19 12 <65> 8b 05 88 c7 19 12 a9 00 01 ff 00 74 1d f6 c4 01 74 67 a9 00 00
RSP: 0018:ffffc9000436f850 EFLAGS: 00000246
RAX: 0000000000000007 RBX: 0000000000000000 RCX: ffffffff822c34c6
RDX: ffff88805bd7da00 RSI: 0000000000000000 RDI: 0000000000000005
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88801ea629b0
R13: ffff88801ea629fc R14: 0000000000000000 R15: dffffc0000000000
 __page_table_check_zero+0x2a6/0x5d0 mm/page_table_check.c:143
 page_table_check_free include/linux/page_table_check.h:43 [inline]
 free_pages_prepare mm/page_alloc.c:1396 [inline]
 __free_frozen_pages+0x7b7/0x10f0 mm/page_alloc.c:2895
 discard_slab mm/slub.c:2753 [inline]
 __put_partials+0x165/0x1c0 mm/slub.c:3218
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x4d/0x120 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x195/0x1e0 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:329
 kasan_slab_alloc include/linux/kasan.h:250 [inline]
 slab_post_alloc_hook mm/slub.c:4180 [inline]
 slab_alloc_node mm/slub.c:4229 [inline]
 __kmalloc_cache_noprof+0x1f1/0x3e0 mm/slub.c:4391
 kmalloc_noprof include/linux/slab.h:905 [inline]
 __kthread_create_on_node+0xce/0x3f0 kernel/kthread.c:510
 kthread_create_on_node+0xc7/0x100 kernel/kthread.c:587
 create_worker+0x416/0x7e0 kernel/workqueue.c:2800
 maybe_create_worker kernel/workqueue.c:3061 [inline]
 manage_workers kernel/workqueue.c:3113 [inline]
 worker_thread+0x9dd/0xf10 kernel/workqueue.c:3375
 kthread+0x3c5/0x780 kernel/kthread.c:463
 ret_from_fork+0x5d4/0x6f0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
net_ratelimit: 14853 callbacks suppressed
bridge0: received packet on veth0_to_bridge with own address as source address (addr:e2:18:63:3e:5d:d4, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:e2:18:63:3e:5d:d4, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:e2:18:63:3e:5d:d4, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:e2:18:63:3e:5d:d4, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:e2:18:63:3e:5d:d4, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:e2:18:63:3e:5d:d4, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:e2:18:63:3e:5d:d4, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:e2:18:63:3e:5d:d4, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:e2:18:63:3e:5d:d4, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:e2:18:63:3e:5d:d4, vlan:0)

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/08/04 18:51 upstream d2eedaa3909b f5bcc8dc .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto INFO: rcu detected stall in nsim_dev_psample_report_work
* Struck through repros no longer work on HEAD.