EXT4-fs error (device loop5): ext4_dirty_inode:6731: inode #2: comm syz-executor: mark_inode_dirty error Buffer I/O error on dev loop5, logical block 1, lost sync page write EXT4-fs (loop5): I/O error while writing superblock Oops: general protection fault, probably for non-canonical address 0xdffffc000000000b: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000058-0x000000000000005f] CPU: 1 UID: 0 PID: 7259 Comm: syz-executor Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 RIP: 0010:klist_put lib/klist.c:212 [inline] RIP: 0010:klist_del lib/klist.c:230 [inline] RIP: 0010:klist_remove+0x156/0x340 lib/klist.c:249 Code: 4d 89 f5 49 c1 ed 03 43 80 7c 3d 00 00 74 08 4c 89 f7 e8 6d 96 64 f6 4d 8b 26 49 83 e4 fe 49 8d 7c 24 58 48 89 f8 48 c1 e8 03 <42> 80 3c 38 00 74 05 e8 4e 96 64 f6 49 8b 44 24 58 48 89 44 24 08 RSP: 0018:ffffc90004b57880 EFLAGS: 00010202 RAX: 000000000000000b RBX: ffff88802890be80 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000058 RBP: ffffc90004b57980 R08: ffffffff903e71e3 R09: 1ffffffff207ce3c R10: dffffc0000000000 R11: fffffbfff207ce3d R12: 0000000000000000 R13: 1ffff1100adcbf0c R14: ffff888056e5f860 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff88812500d000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000350030 CR3: 000000007e61a000 CR4: 00000000003526f0 Call Trace: device_move+0x18e/0x720 drivers/base/core.c:4702 hci_conn_del_sysfs+0xb8/0x1a0 net/bluetooth/hci_sysfs.c:75 hci_conn_cleanup net/bluetooth/hci_conn.c:170 [inline] hci_conn_del+0xc3d/0x1200 net/bluetooth/hci_conn.c:1318 hci_conn_hash_flush+0x189/0x260 net/bluetooth/hci_conn.c:2746 hci_dev_close_sync+0x7fc/0x10a0 net/bluetooth/hci_sync.c:5587 hci_dev_do_close net/bluetooth/hci_core.c:502 [inline] hci_unregister_dev+0x232/0x5b0 net/bluetooth/hci_core.c:2681 vhci_release+0x16d/0x1c0 drivers/bluetooth/hci_vhci.c:700 __fput+0x418/0xa50 fs/file_table.c:512 task_work_run+0x1d9/0x270 kernel/task_work.c:233 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0x73a/0x2360 kernel/exit.c:1008 do_group_exit+0x22d/0x2f0 kernel/exit.c:1151 __do_sys_exit_group kernel/exit.c:1162 [inline] __se_sys_exit_group kernel/exit.c:1160 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1160 x64_sys_call+0x18c6/0x18d0 arch/x86/include/generated/asm/syscalls_64.h:232 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x510 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7feccd59e0d9 Code: Unable to access opcode bytes at 0x7feccd59e0af. RSP: 002b:00007fff65cb0858 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 00007feccd6344e6 RCX: 00007feccd59e0d9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001 RBP: 0000000000000010 R08: 0000000000000000 R09: 00007feccd634474 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff65cb1b10 R13: 00007feccd634474 R14: 00005555580834e8 R15: 00007fff65cb2be0 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:klist_put lib/klist.c:212 [inline] RIP: 0010:klist_del lib/klist.c:230 [inline] RIP: 0010:klist_remove+0x156/0x340 lib/klist.c:249 Code: 4d 89 f5 49 c1 ed 03 43 80 7c 3d 00 00 74 08 4c 89 f7 e8 6d 96 64 f6 4d 8b 26 49 83 e4 fe 49 8d 7c 24 58 48 89 f8 48 c1 e8 03 <42> 80 3c 38 00 74 05 e8 4e 96 64 f6 49 8b 44 24 58 48 89 44 24 08 RSP: 0018:ffffc90004b57880 EFLAGS: 00010202 RAX: 000000000000000b RBX: ffff88802890be80 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000058 RBP: ffffc90004b57980 R08: ffffffff903e71e3 R09: 1ffffffff207ce3c R10: dffffc0000000000 R11: fffffbfff207ce3d R12: 0000000000000000 R13: 1ffff1100adcbf0c R14: ffff888056e5f860 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff88812500d000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fac477ef2f8 CR3: 000000006ffe6000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: 4d 89 f5 mov %r14,%r13 3: 49 c1 ed 03 shr $0x3,%r13 7: 43 80 7c 3d 00 00 cmpb $0x0,0x0(%r13,%r15,1) d: 74 08 je 0x17 f: 4c 89 f7 mov %r14,%rdi 12: e8 6d 96 64 f6 call 0xf6649684 17: 4d 8b 26 mov (%r14),%r12 1a: 49 83 e4 fe and $0xfffffffffffffffe,%r12 1e: 49 8d 7c 24 58 lea 0x58(%r12),%rdi 23: 48 89 f8 mov %rdi,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 38 00 cmpb $0x0,(%rax,%r15,1) <-- trapping instruction 2f: 74 05 je 0x36 31: e8 4e 96 64 f6 call 0xf6649684 36: 49 8b 44 24 58 mov 0x58(%r12),%rax 3b: 48 89 44 24 08 mov %rax,0x8(%rsp)