syzbot

 sign-in | mailing list | source | docs
🐞 Open [1637]
≡ Subsystems
🐞 Fixed [6115]
🐞 Invalid [15318]
⬇ Missing Backports [169]
≡ Crashes
Kernel Health Bugs/Month Bug Lifetimes Fuzzing
Total Repo Heatmap Subsystems Heatmap
💬 Send us feedback

BUG: unable to handle kernel paging request in try_to_wake_up (2)

Status: upstream: reported C repro on 2024/11/26 04:54
Subsystems: net
[Documentation on labels]
Reported-by: syzbot+b7cf50a0c173770dcb14@syzkaller.appspotmail.com
Fix commit: f10bef73fb35 btrfs: flush delalloc workers queue before stopping cleaner kthread during unmount
Patched on: [ci-qemu-gce-upstream-auto ci-qemu-native-arm64-kvm ci-qemu-upstream ci-qemu-upstream-386 ci-qemu2-arm64 ci-qemu2-arm64-compat ci-qemu2-arm64-mte ci-qemu2-riscv64 ci-snapshot-upstream-root ci-upstream-bpf-kasan-gce ci-upstream-bpf-next-kasan-gce ci-upstream-gce-arm64 ci-upstream-gce-leak ci-upstream-kasan-badwrites-root ci-upstream-kasan-gce ci-upstream-kasan-gce-386 ci-upstream-kasan-gce-root ci-upstream-kasan-gce-selinux-root ci-upstream-kasan-gce-smack-root ci-upstream-kmsan-gce-386-root ci-upstream-kmsan-gce-root ci-upstream-linux-next-kasan-gce-root ci-upstream-net-kasan-gce ci-upstream-net-this-kasan-gce ci2-upstream-fs ci2-upstream-kcsan-gce ci2-upstream-usb], missing on: [ci-qemu2-arm32]
First crash: 136d, last: 37d
Cause bisection: failed (error log, bisect log)
  
▶ ▼ Discussions (6)
Title Replies (including bot) Last reply
[PATCH AUTOSEL 5.10 2/7] btrfs: flush delalloc workers queue before stopping cleaner kthread during unmount 1 (1) 2024/12/20 17:14
[PATCH AUTOSEL 5.15 3/9] btrfs: flush delalloc workers queue before stopping cleaner kthread during unmount 1 (1) 2024/12/20 17:13
[PATCH AUTOSEL 6.1 03/12] btrfs: flush delalloc workers queue before stopping cleaner kthread during unmount 1 (1) 2024/12/20 17:13
[PATCH AUTOSEL 6.6 04/16] btrfs: flush delalloc workers queue before stopping cleaner kthread during unmount 1 (1) 2024/12/20 17:12
[PATCH AUTOSEL 6.12 10/29] btrfs: flush delalloc workers queue before stopping cleaner kthread during unmount 1 (1) 2024/12/20 17:11
[syzbot] [block?] BUG: unable to handle kernel paging request in try_to_wake_up (2) 0 (2) 2024/12/03 10:05
▶ ▼ Similar bugs (13)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream general protection fault in try_to_wake_up (2) io-uring C done done 3588 253d 1491d 0/28 closed as invalid on 2024/07/25 16:29
upstream WARNING: locking bug in try_to_wake_up kernel C error 157 137d 317d 28/28 fixed on 2024/11/12 23:31
upstream BUG: unable to handle kernel paging request in try_to_wake_up kernel 1 2677d 2672d 0/28 closed as dup on 2017/12/19 12:14
linux-5.15 KASAN: use-after-free Read in try_to_wake_up C done 71 190d 646d 3/3 fixed on 2024/10/21 12:01
linux-4.14 KASAN: use-after-free Read in try_to_wake_up nilfs2 C 8 759d 880d 0/1 upstream: reported C repro on 2022/10/30 09:08
upstream WARNING: locking bug in try_to_wake_up (2) net syz error 153 4d09h 132d 0/28 upstream: reported syz repro on 2024/11/17 07:17
linux-4.14 general protection fault in try_to_wake_up C done 707 1442d 1472d 1/1 fixed on 2021/05/17 08:49
upstream KASAN: use-after-free Read in try_to_wake_up fs C unreliable 82 1492d 1492d 0/28 closed as invalid on 2021/02/25 16:53
linux-6.1 KASAN: use-after-free Read in try_to_wake_up origin:upstream missing-backport C done 44 294d 726d 3/3 fixed on 2024/07/22 09:08
linux-5.15 KASAN: use-after-free Read in try_to_wake_up (2) 3 80d 112d 0/3 upstream: reported on 2024/12/06 09:57
linux-4.19 general protection fault in try_to_wake_up syz done 229 1384d 1472d 1/1 fixed on 2021/07/14 00:01
linux-6.1 KASAN: use-after-free Read in try_to_wake_up (2) 2 204d 236d 0/3 auto-obsoleted due to no activity on 2024/12/14 10:22
upstream general protection fault in try_to_wake_up kernel syz 1 2560d 2556d 5/28 fixed on 2018/04/06 16:37

Sample crash report:
==================================================================
BUG: KASAN: slab-use-after-free in __lock_acquire+0x78/0x2100 kernel/locking/lockdep.c:5089
Read of size 8 at addr ffff8880259d2818 by task kworker/u8:3/52

CPU: 1 UID: 0 PID: 52 Comm: kworker/u8:3 Not tainted 6.13.0-rc1-syzkaller-00002-gcdd30ebb1b9f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Workqueue: btrfs-delalloc btrfs_work_helper
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0x169/0x550 mm/kasan/report.c:489
 kasan_report+0x143/0x180 mm/kasan/report.c:602
 __lock_acquire+0x78/0x2100 kernel/locking/lockdep.c:5089
 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162
 class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:551 [inline]
 try_to_wake_up+0xc2/0x1470 kernel/sched/core.c:4205
 submit_compressed_extents+0xdf/0x16e0 fs/btrfs/inode.c:1615
 run_ordered_work fs/btrfs/async-thread.c:288 [inline]
 btrfs_work_helper+0x96f/0xc40 fs/btrfs/async-thread.c:324
 process_one_work kernel/workqueue.c:3229 [inline]
 process_scheduled_works+0xa66/0x1840 kernel/workqueue.c:3310
 worker_thread+0x870/0xd30 kernel/workqueue.c:3391
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>

Allocated by task 2:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
 unpoison_slab_object mm/kasan/common.c:319 [inline]
 __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:345
 kasan_slab_alloc include/linux/kasan.h:250 [inline]
 slab_post_alloc_hook mm/slub.c:4104 [inline]
 slab_alloc_node mm/slub.c:4153 [inline]
 kmem_cache_alloc_node_noprof+0x1d9/0x380 mm/slub.c:4205
 alloc_task_struct_node kernel/fork.c:180 [inline]
 dup_task_struct+0x57/0x8c0 kernel/fork.c:1113
 copy_process+0x5d1/0x3d50 kernel/fork.c:2225
 kernel_clone+0x223/0x870 kernel/fork.c:2807
 kernel_thread+0x1bc/0x240 kernel/fork.c:2869
 create_kthread kernel/kthread.c:412 [inline]
 kthreadd+0x60d/0x810 kernel/kthread.c:767
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

Freed by task 24:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:582
 poison_slab_object mm/kasan/common.c:247 [inline]
 __kasan_slab_free+0x59/0x70 mm/kasan/common.c:264
 kasan_slab_free include/linux/kasan.h:233 [inline]
 slab_free_hook mm/slub.c:2338 [inline]
 slab_free mm/slub.c:4598 [inline]
 kmem_cache_free+0x195/0x410 mm/slub.c:4700
 put_task_struct include/linux/sched/task.h:144 [inline]
 delayed_put_task_struct+0x125/0x300 kernel/exit.c:227
 rcu_do_batch kernel/rcu/tree.c:2567 [inline]
 rcu_core+0xaaa/0x17a0 kernel/rcu/tree.c:2823
 handle_softirqs+0x2d4/0x9b0 kernel/softirq.c:554
 run_ksoftirqd+0xca/0x130 kernel/softirq.c:943
 smpboot_thread_fn+0x544/0xa30 kernel/smpboot.c:164
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

Last potentially related work creation:
 kasan_save_stack+0x3f/0x60 mm/kasan/common.c:47
 __kasan_record_aux_stack+0xac/0xc0 mm/kasan/generic.c:544
 __call_rcu_common kernel/rcu/tree.c:3086 [inline]
 call_rcu+0x167/0xa70 kernel/rcu/tree.c:3190
 context_switch kernel/sched/core.c:5372 [inline]
 __schedule+0x1803/0x4be0 kernel/sched/core.c:6756
 __schedule_loop kernel/sched/core.c:6833 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6848
 schedule_timeout+0xb0/0x290 kernel/time/sleep_timeout.c:75
 do_wait_for_common kernel/sched/completion.c:95 [inline]
 __wait_for_common kernel/sched/completion.c:116 [inline]
 wait_for_common kernel/sched/completion.c:127 [inline]
 wait_for_completion+0x355/0x620 kernel/sched/completion.c:148
 kthread_stop+0x19e/0x640 kernel/kthread.c:712
 close_ctree+0x524/0xd60 fs/btrfs/disk-io.c:4328
 generic_shutdown_super+0x139/0x2d0 fs/super.c:642
 kill_anon_super+0x3b/0x70 fs/super.c:1237
 btrfs_kill_super+0x41/0x50 fs/btrfs/super.c:2112
 deactivate_locked_super+0xc4/0x130 fs/super.c:473
 cleanup_mnt+0x41f/0x4b0 fs/namespace.c:1373
 task_work_run+0x24f/0x310 kernel/task_work.c:239
 ptrace_notify+0x2d2/0x380 kernel/signal.c:2503
 ptrace_report_syscall include/linux/ptrace.h:415 [inline]
 ptrace_report_syscall_exit include/linux/ptrace.h:477 [inline]
 syscall_exit_work+0xc7/0x1d0 kernel/entry/common.c:173
 syscall_exit_to_user_mode_prepare kernel/entry/common.c:200 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:205 [inline]
 syscall_exit_to_user_mode+0x24a/0x340 kernel/entry/common.c:218
 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff8880259d1e00
 which belongs to the cache task_struct of size 7424
The buggy address is located 2584 bytes inside of
 freed 7424-byte region [ffff8880259d1e00, ffff8880259d3b00)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x259d0
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff88802f4b56c1
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88801bafe500 dead000000000100 dead000000000122
raw: 0000000000000000 0000000000040004 00000001f5000000 ffff88802f4b56c1
head: 00fff00000000040 ffff88801bafe500 dead000000000100 dead000000000122
head: 0000000000000000 0000000000040004 00000001f5000000 ffff88802f4b56c1
head: 00fff00000000003 ffffea0000967401 ffffffffffffffff 0000000000000000
head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 12, tgid 12 (kworker/u8:1), ts 7328037942, free_ts 0
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1556
 prep_new_page mm/page_alloc.c:1564 [inline]
 get_page_from_freelist+0x3651/0x37a0 mm/page_alloc.c:3474
 __alloc_pages_noprof+0x292/0x710 mm/page_alloc.c:4751
 alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2265
 alloc_slab_page+0x6a/0x140 mm/slub.c:2408
 allocate_slab+0x5a/0x2f0 mm/slub.c:2574
 new_slab mm/slub.c:2627 [inline]
 ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3815
 __slab_alloc+0x58/0xa0 mm/slub.c:3905
 __slab_alloc_node mm/slub.c:3980 [inline]
 slab_alloc_node mm/slub.c:4141 [inline]
 kmem_cache_alloc_node_noprof+0x269/0x380 mm/slub.c:4205
 alloc_task_struct_node kernel/fork.c:180 [inline]
 dup_task_struct+0x57/0x8c0 kernel/fork.c:1113
 copy_process+0x5d1/0x3d50 kernel/fork.c:2225
 kernel_clone+0x223/0x870 kernel/fork.c:2807
 user_mode_thread+0x132/0x1a0 kernel/fork.c:2885
 call_usermodehelper_exec_work+0x5c/0x230 kernel/umh.c:171
 process_one_work kernel/workqueue.c:3229 [inline]
 process_scheduled_works+0xa66/0x1840 kernel/workqueue.c:3310
 worker_thread+0x870/0xd30 kernel/workqueue.c:3391
page_owner free stack trace missing

Memory state around the buggy address:
 ffff8880259d2700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880259d2780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8880259d2800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                            ^
 ffff8880259d2880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880259d2900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================

Crashes (31):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/12/03 10:05 upstream cdd30ebb1b9f 578925bc .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-upstream-fs KASAN: slab-use-after-free Read in try_to_wake_up
2024/12/15 19:07 bpf 2d8308bf5b67 7cbfbb3a .config console log report syz / log [disk image] [vmlinux] [kernel image] ci-upstream-bpf-kasan-gce general protection fault in try_to_wake_up
2025/02/05 12:29 upstream 5c8c229261f1 5896748e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root BUG: unable to handle kernel paging request in try_to_wake_up
2025/01/08 05:39 upstream 09a0fa92e5b4 f3558dbf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root BUG: unable to handle kernel paging request in try_to_wake_up
2025/01/08 00:39 upstream fbfd64d25c7a f3558dbf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root BUG: unable to handle kernel paging request in try_to_wake_up
2025/01/04 10:05 upstream 63676eefb7a0 f3558dbf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root BUG: unable to handle kernel paging request in try_to_wake_up
2025/01/03 16:40 upstream 0bc21e701a6f f3558dbf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root BUG: unable to handle kernel paging request in try_to_wake_up
2025/01/03 01:14 upstream 0bc21e701a6f d3ccff63 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root BUG: unable to handle kernel paging request in try_to_wake_up
2025/01/02 22:15 upstream 0bc21e701a6f d3ccff63 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root BUG: unable to handle kernel paging request in try_to_wake_up
2024/12/30 11:57 upstream fc033cf25e61 d3ccff63 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root BUG: unable to handle kernel paging request in try_to_wake_up
2024/12/29 02:40 upstream 059dd502b263 d3ccff63 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root BUG: unable to handle kernel paging request in try_to_wake_up
2024/12/28 07:47 upstream 8379578b11d5 d3ccff63 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root BUG: unable to handle kernel paging request in try_to_wake_up
2024/12/28 02:10 upstream 8379578b11d5 d3ccff63 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root BUG: unable to handle kernel paging request in try_to_wake_up
2024/12/27 14:45 upstream d6ef8b40d075 d3ccff63 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root BUG: unable to handle kernel paging request in try_to_wake_up
2024/12/25 01:34 upstream 9b2ffa6148b1 444551c4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root BUG: unable to handle kernel paging request in try_to_wake_up
2024/12/20 18:02 upstream 8faabc041a00 1ac6aa80 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root BUG: unable to handle kernel paging request in try_to_wake_up
2024/11/13 02:45 upstream 3022e9d00ebe 62026c85 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root BUG: unable to handle kernel paging request in try_to_wake_up
2025/01/24 02:30 upstream 21266b8df522 f6a35ef3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root KASAN: wild-memory-access Read in try_to_wake_up
2025/01/19 03:49 upstream fda5e3f28400 f2cb035c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root KASAN: wild-memory-access Read in try_to_wake_up
2025/01/19 00:40 upstream fda5e3f28400 f2cb035c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root KASAN: wild-memory-access Read in try_to_wake_up
2024/12/04 07:14 upstream ceb8bf2ceaa7 b50eb251 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs KASAN: slab-use-after-free Read in try_to_wake_up
2024/12/01 01:26 upstream 2ba9f676d0a2 68914665 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs KASAN: slab-use-after-free Read in try_to_wake_up
2024/12/01 00:53 upstream 0e287d31b62b 68914665 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root KASAN: wild-memory-access Read in try_to_wake_up
2024/11/30 15:16 upstream 2ba9f676d0a2 68914665 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs KASAN: slab-use-after-free Read in try_to_wake_up
2024/11/28 19:31 upstream b86545e02e8c 5df23865 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs KASAN: slab-use-after-free Read in try_to_wake_up
2024/11/26 04:54 upstream 2c22dc1ee3a1 a84878fc .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root KASAN: slab-use-after-free Read in try_to_wake_up
2024/11/22 04:35 upstream 28eb75e178d3 4b25d554 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs KASAN: slab-use-after-free Read in try_to_wake_up
2024/11/21 13:17 upstream 43fb83c17ba2 4b25d554 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root KASAN: wild-memory-access Read in try_to_wake_up
2024/11/21 06:24 upstream 8f7c8b88bda4 4b25d554 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs KASAN: slab-use-after-free Read in try_to_wake_up
2025/02/19 13:22 linux-next e5d3fd687aac 9a14138f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-use-after-free Read in try_to_wake_up
2024/12/11 02:03 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 146ff2c261f3 cfc402b4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 KASAN: slab-use-after-free Read in try_to_wake_up
* Struck through repros no longer work on HEAD.