BTRFS info (device loop1): using xxhash64 (xxhash64-generic) checksum algorithm BTRFS info (device loop1): 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: 10127 Comm: syz-executor.1 Not tainted 6.10.0-rc1-syzkaller-00021-ge0cce98fe279 #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 41 50 87 09 48 89 df RSP: 0000:ffffc900075b7780 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffc9002893e000 RDX: 0000000000040000 RSI: ffffffff8158b125 RDI: ffff8880153a7738 RBP: ffff8880153a7700 R08: 0000000000000005 R09: 0000000000000007 R10: 0000000000000002 R11: 0000000000000000 R12: dffffc0000000000 R13: fffffbfff1a92c7d R14: 0000000000000001 R15: 0000000000000002 FS: 0000000000000000(0000) GS:ffff88802c300000(0063) knlGS:00000000f5f19b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 00000000f14e4000 CR3: 0000000063074000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: 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_init_workqueues fs/btrfs/disk-io.c:2010 [inline] open_ctree+0x15cf/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: 0023:0xf7327579 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:00000000f5f19400 EFLAGS: 00000292 ORIG_RAX: 0000000000000015 RAX: ffffffffffffffda RBX: 00000000f5f19460 RCX: 0000000020022280 RDX: 0000000020022240 RSI: 0000000002000040 RDI: 00000000f5f194a0 RBP: 00000000f5f19460 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000296 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 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 41 50 87 09 48 89 df RSP: 0000:ffffc900075b7780 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffc9002893e000 RDX: 0000000000040000 RSI: ffffffff8158b125 RDI: ffff8880153a7738 RBP: ffff8880153a7700 R08: 0000000000000005 R09: 0000000000000007 R10: 0000000000000002 R11: 0000000000000000 R12: dffffc0000000000 R13: fffffbfff1a92c7d R14: 0000000000000001 R15: 0000000000000002 FS: 0000000000000000(0000) GS:ffff88802c200000(0063) knlGS:00000000f5f19b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 00007fe91bec2723 CR3: 0000000063074000 CR4: 0000000000352ef0 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 41 50 87 09 call 0x987507e 3d: 48 89 df mov %rbx,%rdi