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Message-ID: <00000000000059334d0619fcb362@google.com> Date: Mon, 03 Jun 2024 06:56:31 -0700 From: syzbot <syzbot+1b5f11df288ca3853de9@...kaller.appspotmail.com> To: clm@...com, dsterba@...e.com, josef@...icpanda.com, linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com Subject: [syzbot] [btrfs?] general protection fault in apply_wqattrs_cleanup Hello, syzbot found the following issue on: HEAD commit: c3f38fa61af7 Linux 6.10-rc2 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=127bdaba980000 kernel config: https://syzkaller.appspot.com/x/.config?x=998c63c06e77f5e7 dashboard link: https://syzkaller.appspot.com/bug?extid=1b5f11df288ca3853de9 compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 userspace arch: i386 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7bc7510fe41f/non_bootable_disk-c3f38fa6.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/af6a0b581dee/vmlinux-c3f38fa6.xz kernel image: https://storage.googleapis.com/syzbot-assets/47864da8bd74/bzImage-c3f38fa6.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+1b5f11df288ca3853de9@...kaller.appspotmail.com BTRFS info (device loop3): using crc32c (crc32c-intel) checksum algorithm BTRFS info (device loop3): using free-space-tree Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 3 PID: 6690 Comm: syz-executor.3 Not tainted 6.10.0-rc2-syzkaller #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 RIP: 0010:put_pwq_unlocked kernel/workqueue.c:1662 [inline] RIP: 0010:put_pwq_unlocked kernel/workqueue.c:1655 [inline] RIP: 0010:apply_wqattrs_cleanup.part.0+0xbc/0x2b0 kernel/workqueue.c:5223 Code: dd 28 48 89 f8 48 c1 e8 03 42 80 3c 20 00 0f 85 8e 01 00 00 48 8b 5c dd 28 48 85 db 74 41 e8 4b ce 35 00 48 89 d8 48 c1 e8 03 <42> 80 3c 20 00 0f 85 92 01 00 00 48 8b 3b e8 21 70 87 09 48 89 df RSP: 0018:ffffc900078ef740 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffc90003133000 RDX: 0000000000040000 RSI: ffffffff8158b125 RDI: ffff8880002d1128 RBP: ffff8880002d1100 R08: 0000000000000005 R09: 0000000000000007 R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000 R13: fffffbfff1a92c7d R14: 0000000000000001 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff88802c300000(0063) knlGS:00000000f5ef9b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 00000000f7fe3ea0 CR3: 0000000025356000 CR4: 0000000000350ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> apply_wqattrs_cleanup kernel/workqueue.c:5222 [inline] apply_workqueue_attrs_locked+0x9e/0xe0 kernel/workqueue.c:5344 apply_workqueue_attrs kernel/workqueue.c:5374 [inline] alloc_and_link_pwqs kernel/workqueue.c:5502 [inline] alloc_workqueue+0x1496/0x1ca0 kernel/workqueue.c:5717 btrfs_alloc_workqueue+0x21c/0x510 fs/btrfs/async-thread.c:112 btrfs_init_workqueues fs/btrfs/disk-io.c:2015 [inline] open_ctree+0x165d/0x52e0 fs/btrfs/disk-io.c:3362 btrfs_fill_super fs/btrfs/super.c:946 [inline] btrfs_get_tree_super fs/btrfs/super.c:1863 [inline] btrfs_get_tree+0x11e9/0x1b90 fs/btrfs/super.c:2089 vfs_get_tree+0x8f/0x380 fs/super.c:1780 fc_mount+0x16/0xc0 fs/namespace.c:1125 btrfs_get_tree_subvol fs/btrfs/super.c:2052 [inline] btrfs_get_tree+0xa53/0x1b90 fs/btrfs/super.c:2090 vfs_get_tree+0x8f/0x380 fs/super.c:1780 do_new_mount fs/namespace.c:3352 [inline] path_mount+0x6e1/0x1f10 fs/namespace.c:3679 do_mount fs/namespace.c:3692 [inline] __do_sys_mount fs/namespace.c:3898 [inline] __se_sys_mount fs/namespace.c:3875 [inline] __ia32_sys_mount+0x295/0x320 fs/namespace.c:3875 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e RIP: 0023:0xf7307579 Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000f5ef9400 EFLAGS: 00000292 ORIG_RAX: 0000000000000015 RAX: ffffffffffffffda RBX: 00000000f5ef9460 RCX: 0000000020005140 RDX: 0000000020000100 RSI: 0000000000000816 RDI: 00000000f5ef94a0 RBP: 00000000f5ef9460 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000296 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:put_pwq_unlocked kernel/workqueue.c:1662 [inline] RIP: 0010:put_pwq_unlocked kernel/workqueue.c:1655 [inline] RIP: 0010:apply_wqattrs_cleanup.part.0+0xbc/0x2b0 kernel/workqueue.c:5223 Code: dd 28 48 89 f8 48 c1 e8 03 42 80 3c 20 00 0f 85 8e 01 00 00 48 8b 5c dd 28 48 85 db 74 41 e8 4b ce 35 00 48 89 d8 48 c1 e8 03 <42> 80 3c 20 00 0f 85 92 01 00 00 48 8b 3b e8 21 70 87 09 48 89 df RSP: 0018:ffffc900078ef740 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffc90003133000 RDX: 0000000000040000 RSI: ffffffff8158b125 RDI: ffff8880002d1128 RBP: ffff8880002d1100 R08: 0000000000000005 R09: 0000000000000007 R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000 R13: fffffbfff1a92c7d R14: 0000000000000001 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff88802c200000(0063) knlGS:00000000f5ef9b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 00000000f74ba0c4 CR3: 0000000025356000 CR4: 0000000000350ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: dd 28 (bad) (%rax) 2: 48 89 f8 mov %rdi,%rax 5: 48 c1 e8 03 shr $0x3,%rax 9: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) e: 0f 85 8e 01 00 00 jne 0x1a2 14: 48 8b 5c dd 28 mov 0x28(%rbp,%rbx,8),%rbx 19: 48 85 db test %rbx,%rbx 1c: 74 41 je 0x5f 1e: e8 4b ce 35 00 call 0x35ce6e 23: 48 89 d8 mov %rbx,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) <-- trapping instruction 2f: 0f 85 92 01 00 00 jne 0x1c7 35: 48 8b 3b mov (%rbx),%rdi 38: e8 21 70 87 09 call 0x987705e 3d: 48 89 df mov %rbx,%rdi --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@...glegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
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