Hello, syzbot found the following issue on: HEAD commit: b605fdc54c2b Add linux-next specific files for 20220128 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=150084b8700000 kernel config: https://syzkaller.appspot.com/x/.config?x=da5090473475f3ca dashboard link: https://syzkaller.appspot.com/bug?extid=2b3f18414c37b42dcc94 compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 Unfortunately, I don't have any reproducer for this issue yet. IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+2b3f18414c37b42dcc94@xxxxxxxxxxxxxxxxxxxxxxxxx general protection fault, probably for non-canonical address 0xdffffc000000002f: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000178-0x000000000000017f] CPU: 1 PID: 3642 Comm: syz-executor.5 Not tainted 5.17.0-rc1-next-20220128-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:blk_throtl_bio block/blk-throttle.h:175 [inline] RIP: 0010:submit_bio_checks+0x7c0/0x1bf0 block/blk-core.c:765 Code: 08 3c 03 0f 8e 4a 11 00 00 48 b8 00 00 00 00 00 fc ff df 44 8b 6d 10 41 83 e5 01 4a 8d bc 2b 7c 01 00 00 48 89 fa 48 c1 ea 03 <0f> b6 04 02 48 89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 09 11 00 00 RSP: 0018:ffffc900028cf680 EFLAGS: 00010203 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 000000000000002f RSI: ffffffff83d5f41e RDI: 000000000000017d RBP: ffff88801e8be500 R08: ffffffff8a241580 R09: 0000000000000000 R10: ffffffff83d5f410 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000001 R14: 00000000fffffffe R15: ffff88801ad9a4cc FS: 0000555556299400(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fed92bd5ec9 CR3: 000000003b65d000 CR4: 00000000003526e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> __submit_bio+0xaf/0x360 block/blk-core.c:802 __submit_bio_noacct_mq block/blk-core.c:881 [inline] submit_bio_noacct block/blk-core.c:907 [inline] submit_bio_noacct+0x6c9/0x8a0 block/blk-core.c:896 submit_bio block/blk-core.c:968 [inline] submit_bio+0x1ea/0x430 block/blk-core.c:926 write_dev_flush fs/btrfs/disk-io.c:4243 [inline] barrier_all_devices fs/btrfs/disk-io.c:4293 [inline] write_all_supers+0x3038/0x4440 fs/btrfs/disk-io.c:4388 btrfs_commit_transaction+0x1be3/0x3180 fs/btrfs/transaction.c:2362 btrfs_commit_super+0xc1/0x100 fs/btrfs/disk-io.c:4562 close_ctree+0x314/0xccc fs/btrfs/disk-io.c:4671 generic_shutdown_super+0x14c/0x400 fs/super.c:462 kill_anon_super+0x36/0x60 fs/super.c:1056 btrfs_kill_super+0x38/0x50 fs/btrfs/super.c:2365 deactivate_locked_super+0x94/0x160 fs/super.c:332 deactivate_super+0xad/0xd0 fs/super.c:363 cleanup_mnt+0x3a2/0x540 fs/namespace.c:1159 task_work_run+0xdd/0x1a0 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_user_mode_loop kernel/entry/common.c:175 [inline] exit_to_user_mode_prepare+0x27e/0x290 kernel/entry/common.c:207 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fe814b274c7 Code: ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffe14eb15c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007fe814b274c7 RDX: 00007ffe14eb169b RSI: 000000000000000a RDI: 00007ffe14eb1690 RBP: 00007ffe14eb1690 R08: 00000000ffffffff R09: 00007ffe14eb1460 R10: 000055555629a8b3 R11: 0000000000000246 R12: 00007fe814b7f1ea R13: 00007ffe14eb2750 R14: 000055555629a810 R15: 00007ffe14eb2790 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:blk_throtl_bio block/blk-throttle.h:175 [inline] RIP: 0010:submit_bio_checks+0x7c0/0x1bf0 block/blk-core.c:765 Code: 08 3c 03 0f 8e 4a 11 00 00 48 b8 00 00 00 00 00 fc ff df 44 8b 6d 10 41 83 e5 01 4a 8d bc 2b 7c 01 00 00 48 89 fa 48 c1 ea 03 <0f> b6 04 02 48 89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 09 11 00 00 RSP: 0018:ffffc900028cf680 EFLAGS: 00010203 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 000000000000002f RSI: ffffffff83d5f41e RDI: 000000000000017d RBP: ffff88801e8be500 R08: ffffffff8a241580 R09: 0000000000000000 R10: ffffffff83d5f410 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000001 R14: 00000000fffffffe R15: ffff88801ad9a4cc FS: 0000555556299400(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffeece8b278 CR3: 000000003b65d000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 08 3c 03 or %bh,(%rbx,%rax,1) 3: 0f 8e 4a 11 00 00 jle 0x1153 9: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 10: fc ff df 13: 44 8b 6d 10 mov 0x10(%rbp),%r13d 17: 41 83 e5 01 and $0x1,%r13d 1b: 4a 8d bc 2b 7c 01 00 lea 0x17c(%rbx,%r13,1),%rdi 22: 00 23: 48 89 fa mov %rdi,%rdx 26: 48 c1 ea 03 shr $0x3,%rdx * 2a: 0f b6 04 02 movzbl (%rdx,%rax,1),%eax <-- trapping instruction 2e: 48 89 fa mov %rdi,%rdx 31: 83 e2 07 and $0x7,%edx 34: 38 d0 cmp %dl,%al 36: 7f 08 jg 0x40 38: 84 c0 test %al,%al 3a: 0f 85 09 11 00 00 jne 0x1149 --- This report is generated by a bot. 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