Messages in this thread | | | From | Hao Sun <> | Date | Tue, 14 Sep 2021 10:44:35 +0800 | Subject | INFO: task hung in btrfs_alloc_tree_block |
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Hello,
When using Healer to fuzz the latest Linux kernel, the following crash was triggered.
HEAD commit: 6880fa6c5660 Linux 5.15-rc1 git tree: upstream console output: https://drive.google.com/file/d/1U3ei_jCODG9N5UHOspSRmykrEDSey3Qn/view?usp=sharing kernel config: https://drive.google.com/file/d/1rUzyMbe5vcs6khA3tL9EHTLJvsUdWcgB/view?usp=sharing
Sorry, I don't have a reproducer for this crash, hope the symbolized report can help. If you fix this issue, please add the following tag to the commit: Reported-by: Hao Sun <sunhao.th@gmail.com>
INFO: task syz-executor:6566 blocked for more than 143 seconds. Not tainted 5.15.0-rc1 #16 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor state:D stack:10632 pid: 6566 ppid: 1 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4940 [inline] __schedule+0x323/0xae0 kernel/sched/core.c:6287 schedule+0x36/0xe0 kernel/sched/core.c:6366 rwsem_down_write_slowpath kernel/locking/rwsem.c:1107 [inline] __down_write_common.part.13+0x356/0x7a0 kernel/locking/rwsem.c:1262 __btrfs_tree_lock+0x2e/0x1a0 fs/btrfs/locking.c:112 btrfs_init_new_buffer fs/btrfs/extent-tree.c:4740 [inline] btrfs_alloc_tree_block+0x19c/0x670 fs/btrfs/extent-tree.c:4818 __btrfs_cow_block+0x16f/0x7d0 fs/btrfs/ctree.c:415 btrfs_cow_block+0x12a/0x300 fs/btrfs/ctree.c:570 btrfs_search_slot+0x6b0/0xee0 fs/btrfs/ctree.c:1768 btrfs_update_root+0x6b/0x430 fs/btrfs/root-tree.c:134 commit_fs_roots+0x151/0x220 fs/btrfs/transaction.c:1373 btrfs_commit_transaction+0x443/0x1430 fs/btrfs/transaction.c:2265 btrfs_sync_fs+0x9a/0x430 fs/btrfs/super.c:1426 __sync_filesystem fs/sync.c:39 [inline] sync_filesystem+0x9b/0xd0 fs/sync.c:67 generic_shutdown_super+0x30/0x170 fs/super.c:448 kill_anon_super+0x15/0x30 fs/super.c:1057 btrfs_kill_super+0x19/0x30 fs/btrfs/super.c:2348 deactivate_locked_super+0x43/0x80 fs/super.c:335 deactivate_super+0x53/0x80 fs/super.c:366 cleanup_mnt+0x138/0x1b0 fs/namespace.c:1137 task_work_run+0x86/0xd0 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:175 [inline] exit_to_user_mode_prepare+0x271/0x280 kernel/entry/common.c:209 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:302 do_syscall_64+0x40/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x46c777 RSP: 002b:00007ffc3accc0b8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 000000000046c777 RDX: 0000000000404e22 RSI: 0000000000000002 RDI: 00007ffc3accc180 RBP: 00007ffc3accc180 R08: 00000000025c8033 R09: 0000000000000009 R10: 00000000fffffffb R11: 0000000000000246 R12: 00000000004e38c6 R13: 00007ffc3accd230 R14: 00007ffc3accd22c R15: 0000000000000006 INFO: lockdep is turned off. NMI backtrace for cpu 1 CPU: 1 PID: 39 Comm: khungtaskd Not tainted 5.15.0-rc1 #16 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x8d/0xcf lib/dump_stack.c:106 nmi_cpu_backtrace+0x1e9/0x210 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x120/0x180 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline] watchdog+0x4e1/0x980 kernel/hung_task.c:295 kthread+0x178/0x1b0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Sending NMI from CPU 1 to CPUs 0,2-3: NMI backtrace for cpu 2 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline] NMI backtrace for cpu 2 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline] NMI backtrace for cpu 2 skipped: idling at default_idle+0xb/0x10 arch/x86/kernel/process.c:716 NMI backtrace for cpu 0 CPU: 0 PID: 3014 Comm: systemd-journal Not tainted 5.15.0-rc1 #16 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014 RIP: 0010:__seccomp_filter+0x29/0x890 kernel/seccomp.c:1173 Code: 00 41 57 41 56 49 89 f6 41 55 41 54 55 53 48 83 ec 60 65 48 8b 04 25 28 00 00 00 48 89 44 24 58 31 c0 89 7c 24 08 89 54 24 0c <e8> 62 b3 ff ff 4d 85 f6 0f 84 ed 03 00 00 e8 54 b3 ff ff 65 48 8b RSP: 0018:ffffc900008a3e50 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffff888104294480 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000027 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000027 R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000000 FS: 00007f0e1f6808c0(0000) GS:ffff88807dc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f0e1cac7000 CR3: 000000000e6b1000 CR4: 0000000000750ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 PKRU: 55555554 Call Trace: __secure_computing+0x66/0x150 kernel/seccomp.c:1311 syscall_trace_enter.isra.17+0x9c/0x270 kernel/entry/common.c:68 do_syscall_64+0x15/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f0e1e919f17 Code: ff ff ff 48 8b 4d a0 0f b7 51 fe 48 8b 4d a8 66 89 54 08 fe e9 1a ff ff ff 66 2e 0f 1f 84 00 00 00 00 00 b8 27 00 00 00 0f 05 <c3> 0f 1f 84 00 00 00 00 00 b8 6e 00 00 00 0f 05 c3 0f 1f 84 00 00 RSP: 002b:00007ffd23799818 EFLAGS: 00000206 ORIG_RAX: 0000000000000027 RAX: ffffffffffffffda RBX: 00005565147301e0 RCX: 00007f0e1e919f17 RDX: 00007ffd237998d8 RSI: 0000000000000001 RDI: 00005565147301e0 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000069 R11: 0000000000000206 R12: 00007ffd237998d8 R13: 0000000000000bc6 R14: 00007ffd2379c6c0 R15: 00007ffd23799cd0 NMI backtrace for cpu 3 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline] NMI backtrace for cpu 3 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline] NMI backtrace for cpu 3 skipped: idling at default_idle+0xb/0x10 arch/x86/kernel/process.c:716 ---------------- Code disassembly (best guess): 0: 00 41 57 add %al,0x57(%rcx) 3: 41 56 push %r14 5: 49 89 f6 mov %rsi,%r14 8: 41 55 push %r13 a: 41 54 push %r12 c: 55 push %rbp d: 53 push %rbx e: 48 83 ec 60 sub $0x60,%rsp 12: 65 48 8b 04 25 28 00 mov %gs:0x28,%rax 19: 00 00 1b: 48 89 44 24 58 mov %rax,0x58(%rsp) 20: 31 c0 xor %eax,%eax 22: 89 7c 24 08 mov %edi,0x8(%rsp) 26: 89 54 24 0c mov %edx,0xc(%rsp) * 2a: e8 62 b3 ff ff callq 0xffffb391 <-- trapping instruction 2f: 4d 85 f6 test %r14,%r14 32: 0f 84 ed 03 00 00 je 0x425 38: e8 54 b3 ff ff callq 0xffffb391 3d: 65 gs 3e: 48 rex.W 3f: 8b .byte 0x8b
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