BUG: soft lockup in syscall_exit_to_user_mode

Status: auto-obsoleted due to no activity on 2024/11/18 18:22
Bug presence: origin:lts
[Documentation on labels]
Reported-by: syzbot+190d662da0b79bb11eee@syzkaller.appspotmail.com
First crash: 830d, last: 716d
▶ ▼ Bug presence (3)
Date Name Commit Repro Result
2024/05/24 lts (merge base) 458ce51d0356 C [report] BUG: soft lockup in sock_close
2024/10/29 lts (merge base) 3a5928702e71 C Didn't crash
2024/05/24 upstream (ToT) 6d69b6c12fce C Didn't crash
▶ ▼ Similar bugs (6)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: rcu detected stall in syscall_exit_to_user_mode (2) usb 1 syz, C inconclusive error 807 193d 1330d 0/29 upstream: reported C repro on 2022/12/05 19:46
android-5-15 BUG: soft lockup in syscall_exit_to_user_mode (2) 1 1 613d 613d 0/2 auto-obsoleted due to no activity on 2025/02/19 23:24
upstream INFO: rcu detected stall in syscall_exit_to_user_mode cgroups mm 1 78 1615d 1795d 20/29 fixed on 2022/03/08 16:11
linux-6.1 INFO: rcu detected stall in syscall_exit_to_user_mode origin:upstream missing-backport 1 syz, C done 364 11h53m 1208d 0/3 upstream: reported C repro on 2023/04/07 08:31
linux-6.6 INFO: rcu detected stall in syscall_exit_to_user_mode origin:lts-only 1 syz, C done 124 8d22h 399d 0/2 upstream: reported C repro on 2025/06/24 16:00
linux-5.15 INFO: rcu detected stall in syscall_exit_to_user_mode missing-backport origin:upstream 1 syz, C done 1643 18h01m 1066d 0/3 upstream: reported C repro on 2023/08/26 22:23
▶ ▼ Last patch testing requests (2)
Created Duration User Patch Repo Result
2024/09/10 01:28 1h12m retest repro android13-5.15-lts report log
2024/07/01 22:51 9m retest repro android13-5.15-lts report log

Sample crash report:
watchdog: BUG: soft lockup - CPU#0 stuck for 246s! [syz.4.2519:8615]
Modules linked in:
CPU: 0 PID: 8615 Comm: syz.4.2519 Tainted: G        W         5.15.152-syzkaller-00143-g70e1a731d986 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
RIP: 0010:native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline]
RIP: 0010:arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline]
RIP: 0010:kvm_wait+0x147/0x180 arch/x86/kernel/kvm.c:918
Code: 4c 89 e8 48 c1 e8 03 42 0f b6 04 20 84 c0 44 8b 74 24 1c 75 34 41 0f b6 45 00 44 38 f0 75 10 66 90 0f 00 2d 2b 02 13 04 fb f4 <e9> 24 ff ff ff fb e9 1e ff ff ff 44 89 e9 80 e1 07 38 c1 7c a3 4c
RSP: 0018:ffffc90001abe120 EFLAGS: 00000246
RAX: 0000000000000003 RBX: 1ffff92000357c28 RCX: ffffffff8155068f
RDX: dffffc0000000000 RSI: 0000000000000003 RDI: ffff88810c5deb58
RBP: ffffc90001abe1d0 R08: dffffc0000000000 R09: ffffed10218bbd6c
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: ffff88810c5deb58 R14: 0000000000000003 R15: 1ffff92000357c2c
FS:  0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555556f5a4a8 CR3: 0000000006a0f000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 </IRQ>
 <TASK>
 pv_wait arch/x86/include/asm/paravirt.h:597 [inline]
 pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:470 [inline]
 __pv_queued_spin_lock_slowpath+0x6bc/0xc40 kernel/locking/qspinlock.c:508
 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:585 [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 include/linux/spinlock.h:187 [inline]
 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:136 [inline]
 _raw_spin_lock_bh+0x139/0x1b0 kernel/locking/spinlock.c:178
 sock_hash_delete_elem+0xb1/0x2f0 net/core/sock_map.c:937
 bpf_prog_2c29ac5cdc6b1842+0x3a/0xc7c
 bpf_dispatcher_nop_func include/linux/bpf.h:785 [inline]
 __bpf_prog_run include/linux/filter.h:625 [inline]
 bpf_prog_run include/linux/filter.h:632 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:1880 [inline]
 bpf_trace_run4+0x13f/0x270 kernel/trace/bpf_trace.c:1919
 __bpf_trace_mm_page_alloc+0xbf/0xf0 include/trace/events/kmem.h:201
 trace_mm_page_alloc include/trace/events/kmem.h:201 [inline]
 __alloc_pages+0x3cb/0x8f0 mm/page_alloc.c:5799
 __alloc_pages_node include/linux/gfp.h:591 [inline]
 alloc_pages_node include/linux/gfp.h:605 [inline]
 alloc_pages include/linux/gfp.h:618 [inline]
 __stack_depot_save+0x38d/0x470 lib/stackdepot.c:326
 stack_depot_save+0xe/0x10 lib/stackdepot.c:383
 save_stack+0x104/0x1e0 mm/page_owner.c:140
 __set_page_owner+0x28/0x2e0 mm/page_owner.c:200
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x1a3/0x1b0 mm/page_alloc.c:2605
 prep_new_page+0x1b/0x110 mm/page_alloc.c:2611
 get_page_from_freelist+0x3550/0x35d0 mm/page_alloc.c:4485
 __alloc_pages+0x27e/0x8f0 mm/page_alloc.c:5777
 __alloc_pages_node include/linux/gfp.h:591 [inline]
 alloc_pages_node include/linux/gfp.h:605 [inline]
 alloc_pages include/linux/gfp.h:618 [inline]
 __stack_depot_save+0x38d/0x470 lib/stackdepot.c:326
 kasan_save_stack mm/kasan/common.c:39 [inline]
 kasan_set_track+0x5d/0x70 mm/kasan/common.c:45
 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370
 ____kasan_slab_free+0x126/0x160 mm/kasan/common.c:365
 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:373
 kasan_slab_free include/linux/kasan.h:193 [inline]
 slab_free_hook mm/slub.c:1723 [inline]
 slab_free_freelist_hook+0xbd/0x190 mm/slub.c:1749
 slab_free mm/slub.c:3519 [inline]
 kfree+0xc8/0x220 mm/slub.c:4579
 sk_psock_free_link include/linux/skmsg.h:420 [inline]
 sock_map_del_link net/core/sock_map.c:160 [inline]
 sock_map_unref+0x352/0x4d0 net/core/sock_map.c:182
 sock_hash_delete_elem+0x274/0x2f0 net/core/sock_map.c:941
 bpf_prog_2c29ac5cdc6b1842+0x3a/0xc7c
 bpf_dispatcher_nop_func include/linux/bpf.h:785 [inline]
 __bpf_prog_run include/linux/filter.h:625 [inline]
 bpf_prog_run include/linux/filter.h:632 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:1880 [inline]
 bpf_trace_run4+0x13f/0x270 kernel/trace/bpf_trace.c:1919
 __bpf_trace_mm_page_alloc+0xbf/0xf0 include/trace/events/kmem.h:201
 trace_mm_page_alloc include/trace/events/kmem.h:201 [inline]
 __alloc_pages+0x3cb/0x8f0 mm/page_alloc.c:5799
 __alloc_pages_node include/linux/gfp.h:591 [inline]
 alloc_pages_node include/linux/gfp.h:605 [inline]
 alloc_pages include/linux/gfp.h:618 [inline]
 __get_free_pages+0x10/0x30 mm/page_alloc.c:5814
 tlb_next_batch mm/mmu_gather.c:29 [inline]
 __tlb_remove_page_size+0x178/0x300 mm/mmu_gather.c:83
 __tlb_remove_page include/asm-generic/tlb.h:444 [inline]
 zap_pte_range mm/memory.c:1437 [inline]
 zap_pmd_range mm/memory.c:1559 [inline]
 zap_pud_range mm/memory.c:1588 [inline]
 zap_p4d_range mm/memory.c:1609 [inline]
 unmap_page_range+0x1226/0x1ed0 mm/memory.c:1630
 unmap_single_vma mm/memory.c:1675 [inline]
 unmap_vmas+0x389/0x560 mm/memory.c:1707
 exit_mmap+0x3e4/0x940 mm/mmap.c:3215
 __mmput+0x95/0x310 kernel/fork.c:1179
 mmput+0x5b/0x170 kernel/fork.c:1202
 exit_mm kernel/exit.c:552 [inline]
 do_exit+0xb9c/0x2ca0 kernel/exit.c:865
 do_group_exit+0x141/0x310 kernel/exit.c:1000
 get_signal+0x7a3/0x1630 kernel/signal.c:2896
 arch_do_signal_or_restart+0xbd/0x1680 arch/x86/kernel/signal.c:867
 handle_signal_work kernel/entry/common.c:148 [inline]
 exit_to_user_mode_loop+0xa0/0xe0 kernel/entry/common.c:172
 exit_to_user_mode_prepare+0x5a/0xa0 kernel/entry/common.c:208
 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
 syscall_exit_to_user_mode+0x26/0x160 kernel/entry/common.c:301
 do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7fae6aae99f9
Code: Unable to access opcode bytes at RIP 0x7fae6aae99cf.
RSP: 002b:00007fae697480e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007fae6ac78060 RCX: 00007fae6aae99f9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fae6ac78060
RBP: 00007fae6ac78058 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fae6ac78064
R13: 0000000000000000 R14: 00007fff4c6f0c00 R15: 00007fff4c6f0ce8
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 8629 Comm: syz.3.2526 Tainted: G        W         5.15.152-syzkaller-00143-g70e1a731d986 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
RIP: 0010:native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline]
RIP: 0010:arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline]
RIP: 0010:kvm_wait+0x147/0x180 arch/x86/kernel/kvm.c:918
Code: 4c 89 e8 48 c1 e8 03 42 0f b6 04 20 84 c0 44 8b 74 24 1c 75 34 41 0f b6 45 00 44 38 f0 75 10 66 90 0f 00 2d 2b 02 13 04 fb f4 <e9> 24 ff ff ff fb e9 1e ff ff ff 44 89 e9 80 e1 07 38 c1 7c a3 4c
RSP: 0018:ffffc90001927520 EFLAGS: 00000246
RAX: 0000000000000001 RBX: 1ffff92000324ea8 RCX: 1ffffffff0d5aa9c
RDX: 0000000000000001 RSI: 0000000000000001 RDI: ffff8881f7138ad4
RBP: ffffc900019275d0 R08: dffffc0000000000 R09: ffffed103ee2715b
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: ffff8881f7138ad4 R14: 0000000000000001 R15: 1ffff92000324eac
FS:  00007f62be0526c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020001080 CR3: 00000001b0a0f000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 pv_wait arch/x86/include/asm/paravirt.h:597 [inline]
 pv_wait_node kernel/locking/qspinlock_paravirt.h:325 [inline]
 __pv_queued_spin_lock_slowpath+0x41b/0xc40 kernel/locking/qspinlock.c:473
 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:585 [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 include/linux/spinlock.h:187 [inline]
 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:136 [inline]
 _raw_spin_lock_bh+0x139/0x1b0 kernel/locking/spinlock.c:178
 sock_hash_delete_elem+0xb1/0x2f0 net/core/sock_map.c:937
 bpf_prog_2c29ac5cdc6b1842+0x3a/0xc7c
 bpf_dispatcher_nop_func include/linux/bpf.h:785 [inline]
 __bpf_prog_run include/linux/filter.h:625 [inline]
 bpf_prog_run include/linux/filter.h:632 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:1880 [inline]
 bpf_trace_run4+0x13f/0x270 kernel/trace/bpf_trace.c:1919
 __bpf_trace_mm_page_alloc+0xbf/0xf0 include/trace/events/kmem.h:201
 trace_mm_page_alloc include/trace/events/kmem.h:201 [inline]
 __alloc_pages+0x3cb/0x8f0 mm/page_alloc.c:5799
 __vmalloc_area_node mm/vmalloc.c:2955 [inline]
 __vmalloc_node_range+0x482/0x8d0 mm/vmalloc.c:3086
 __vmalloc_node mm/vmalloc.c:3151 [inline]
 __vmalloc+0x7a/0x90 mm/vmalloc.c:3165
 bpf_prog_alloc_no_stats+0x3b/0x2f0 kernel/bpf/core.c:90
 bpf_prog_alloc+0x1f/0x1e0 kernel/bpf/core.c:124
 bpf_prog_load+0x800/0x1b50 kernel/bpf/syscall.c:2280
 __sys_bpf+0x4bc/0x760 kernel/bpf/syscall.c:4633
 __do_sys_bpf kernel/bpf/syscall.c:4737 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:4735 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:4735
 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: 0033:0x7f62bf3d29f9
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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f62be052038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f62bf560f80 RCX: 00007f62bf3d29f9
RDX: 0000000000000090 RSI: 00000000200005c0 RDI: 0000000000000005
RBP: 00007f62bf4408ee R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f62bf560f80 R15: 00007ffccf557528
 </TASK>

Crashes (16):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/08/10 18:21 android13-5.15-lts 70e1a731d986 6f4edef4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15-perf BUG: soft lockup in syscall_exit_to_user_mode
2024/07/29 09:59 android13-5.15-lts d0a6506ecafd 5187fc86 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15-perf BUG: soft lockup in syscall_exit_to_user_mode
2024/07/07 09:57 android13-5.15-lts 9044d25b8ff5 2a40360c .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 BUG: soft lockup in syscall_exit_to_user_mode
2024/06/17 22:03 android13-5.15-lts 85445b5a2107 1f11cfd7 .config console log report info ci2-android-5-15-perf BUG: soft lockup in syscall_exit_to_user_mode
2024/06/11 02:54 android13-5.15-lts 79bd336c7a94 048c640a .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15-perf BUG: soft lockup in syscall_exit_to_user_mode
2024/06/03 05:41 android13-5.15-lts 424f92bcbe8f 3113787f .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 BUG: soft lockup in syscall_exit_to_user_mode
2024/05/26 03:19 android13-5.15-lts 424f92bcbe8f a10a183e .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15-perf BUG: soft lockup in syscall_exit_to_user_mode
2024/05/23 18:17 android13-5.15-lts 5d96939590c0 4c2072ee .config console log report syz C ci2-android-5-15-perf BUG: soft lockup in syscall_exit_to_user_mode
2024/05/17 20:55 android13-5.15-lts 5d96939590c0 a12e99e7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 BUG: soft lockup in syscall_exit_to_user_mode
2024/05/17 16:18 android13-5.15-lts 5d96939590c0 a12e99e7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 BUG: soft lockup in syscall_exit_to_user_mode
2024/05/11 22:24 android13-5.15-lts 5d96939590c0 9026e142 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 BUG: soft lockup in syscall_exit_to_user_mode
2024/04/29 18:11 android13-5.15-lts 5d96939590c0 27e33c58 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 BUG: soft lockup in syscall_exit_to_user_mode
2024/04/28 13:42 android13-5.15-lts 5d96939590c0 07b455f9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 BUG: soft lockup in syscall_exit_to_user_mode
2024/04/26 23:48 android13-5.15-lts 5d96939590c0 059e9963 .config console log report info ci2-android-5-15 BUG: soft lockup in syscall_exit_to_user_mode
2024/04/24 07:58 android13-5.15-lts ad06eaf051cd 21339d7b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 BUG: soft lockup in syscall_exit_to_user_mode
2024/04/19 07:13 android13-5.15-lts ad06eaf051cd af24b050 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 BUG: soft lockup in syscall_exit_to_user_mode
* Struck through repros no longer work on HEAD.