INFO: task syz-executor938:8082 blocked for more than 140 seconds. Not tainted 4.19.211-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor938 D27952 8082 8080 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 schedule+0x8d/0x1b0 kernel/sched/core.c:3561 __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:589 [inline] rwsem_down_write_failed+0x3aa/0x760 kernel/locking/rwsem-xadd.c:618 call_rwsem_down_write_failed+0x13/0x20 arch/x86/lib/rwsem.S:117 __down_write arch/x86/include/asm/rwsem.h:142 [inline] down_write+0x4f/0x90 kernel/locking/rwsem.c:72 inode_lock include/linux/fs.h:748 [inline] fuse_reverse_inval_entry+0xaa/0x660 fs/fuse/dir.c:987 fuse_notify_inval_entry fs/fuse/dev.c:1535 [inline] fuse_notify fs/fuse/dev.c:1810 [inline] fuse_dev_do_write+0x251c/0x2bc0 fs/fuse/dev.c:1894 fuse_dev_write+0x153/0x1e0 fs/fuse/dev.c:1978 call_write_iter include/linux/fs.h:1821 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x51b/0x770 fs/read_write.c:487 vfs_write+0x1f3/0x540 fs/read_write.c:549 ksys_write+0x12b/0x2a0 fs/read_write.c:599 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7fa76fb18b79 Code: Bad RIP value. RSP: 002b:00007fa76fac22f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fa76fb9a4a0 RCX: 00007fa76fb18b79 RDX: 0000000000000029 RSI: 00000000200043c0 RDI: 0000000000000003 RBP: 00007fa76fb672d4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e R13: 64695f70756f7267 R14: 2f30656c69662f2e R15: 00007fa76fb9a4a8 INFO: task syz-executor938:8085 blocked for more than 140 seconds. Not tainted 4.19.211-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor938 D28488 8085 8080 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 schedule+0x8d/0x1b0 kernel/sched/core.c:3561 request_wait_answer+0x3dc/0x750 fs/fuse/dev.c:485 __fuse_request_send+0x123/0x1c0 fs/fuse/dev.c:505 fuse_simple_request+0x2e6/0x820 fs/fuse/dev.c:576 fuse_lookup_name+0x24c/0x5c0 fs/fuse/dir.c:330 fuse_lookup+0xdf/0x410 fs/fuse/dir.c:368 __lookup_hash+0x117/0x180 fs/namei.c:1547 filename_create+0x186/0x490 fs/namei.c:3639 user_path_create fs/namei.c:3696 [inline] do_mkdirat+0xa0/0x2d0 fs/namei.c:3834 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7fa76fb18b79 Code: Bad RIP value. RSP: 002b:00007fa76faa12f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 00007fa76fb9a4b0 RCX: 00007fa76fb18b79 RDX: 0000000000000000 RSI: 0000000020004380 RDI: 00000000ffffff9c RBP: 00007fa76fb672d4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e R13: 64695f70756f7267 R14: 2f30656c69662f2e R15: 00007fa76fb9a4b8 Showing all locks held in the system: 1 lock held by khungtaskd/1571: #0: 0000000021e1c10e (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4441 1 lock held by in:imklog/7804: #0: 0000000074d9429a (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767 2 locks held by syz-executor938/8082: #0: 00000000ee9434ce (&fc->killsb){.+.+}, at: fuse_notify_inval_entry fs/fuse/dev.c:1532 [inline] #0: 00000000ee9434ce (&fc->killsb){.+.+}, at: fuse_notify fs/fuse/dev.c:1810 [inline] #0: 00000000ee9434ce (&fc->killsb){.+.+}, at: fuse_dev_do_write+0x24c7/0x2bc0 fs/fuse/dev.c:1894 #1: 000000005e29af3a (&type->i_mutex_dir_key#8){+.+.}, at: inode_lock include/linux/fs.h:748 [inline] #1: 000000005e29af3a (&type->i_mutex_dir_key#8){+.+.}, at: fuse_reverse_inval_entry+0xaa/0x660 fs/fuse/dir.c:987 3 locks held by syz-executor938/8085: #0: 0000000099df943e (sb_writers#12){.+.+}, at: sb_start_write include/linux/fs.h:1579 [inline] #0: 0000000099df943e (sb_writers#12){.+.+}, at: mnt_want_write+0x3a/0xb0 fs/namespace.c:360 #1: 000000005e29af3a (&type->i_mutex_dir_key#7/1){+.+.}, at: inode_lock_nested include/linux/fs.h:783 [inline] #1: 000000005e29af3a (&type->i_mutex_dir_key#7/1){+.+.}, at: filename_create+0x15a/0x490 fs/namei.c:3638 #2: 000000004006c1e8 (&fi->mutex){+.+.}, at: fuse_lock_inode+0xaf/0xe0 fs/fuse/inode.c:365 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1571 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline] watchdog+0x991/0xe60 kernel/hung_task.c:287 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 4694 Comm: systemd-journal Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__bpf_prog_run32+0x0/0xd0 kernel/bpf/core.c:1450 Code: 00 00 00 48 8b 8c 24 18 01 00 00 65 48 2b 0c 25 28 00 00 00 75 0c 48 81 c4 20 01 00 00 5b 5d 41 5c c3 e8 03 03 cb ff 0f 1f 00 <48> b8 00 00 00 00 00 fc ff df 41 54 49 89 fc 55 48 89 f5 53 48 81 RSP: 0018:ffff8880a0f57bb8 EFLAGS: 00000246 RAX: 1ffff9200035a406 RBX: ffff8880a10c76c0 RCX: ffffffff8162b98c RDX: 0000000000000000 RSI: ffffc90001ad2038 RDI: ffff8880a0f57e70 RBP: ffffc90001ad2000 R08: 0000000000000000 R09: 000000007fff0000 R10: 0000000000000004 R11: 0000000000000000 R12: dffffc0000000000 R13: 000000007fff0000 R14: 000000007fff0000 R15: 000000007fff0000 FS: 00007fbf760d48c0(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fbf734a9000 CR3: 00000000a140c000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: seccomp_run_filters+0x124/0x590 kernel/seccomp.c:211 __seccomp_filter+0x93/0xca0 kernel/seccomp.c:667 __secure_computing+0xfc/0x360 kernel/seccomp.c:796 syscall_trace_enter+0x563/0xd60 arch/x86/entry/common.c:121 do_syscall_64+0x486/0x620 arch/x86/entry/common.c:283 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7fbf7536cf17 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 0f 1f 84 00 00 00 00 00 b8 6e 00 00 00 0f 05 c3 0f 1f 84 00 00 RSP: 002b:00007ffdf62ab8d8 EFLAGS: 00000202 ORIG_RAX: 0000000000000027 RAX: ffffffffffffffda RBX: 0000562e06bf51e0 RCX: 00007fbf7536cf17 RDX: 00007ffdf62ab998 RSI: 0000000000000001 RDI: 0000562e06bf51e0 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000069 R11: 0000000000000202 R12: 00007ffdf62ab998 R13: 0000000000001256 R14: 00007ffdf62ae780 R15: 00007ffdf62abd90 ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: 00 48 8b add %cl,-0x75(%rax) 5: 8c 24 18 mov %fs,(%rax,%rbx,1) 8: 01 00 add %eax,(%rax) a: 00 65 48 add %ah,0x48(%rbp) d: 2b 0c 25 28 00 00 00 sub 0x28,%ecx 14: 75 0c jne 0x22 16: 48 81 c4 20 01 00 00 add $0x120,%rsp 1d: 5b pop %rbx 1e: 5d pop %rbp 1f: 41 5c pop %r12 21: c3 retq 22: e8 03 03 cb ff callq 0xffcb032a 27: 0f 1f 00 nopl (%rax) * 2a: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax <-- trapping instruction 31: fc ff df 34: 41 54 push %r12 36: 49 89 fc mov %rdi,%r12 39: 55 push %rbp 3a: 48 89 f5 mov %rsi,%rbp 3d: 53 push %rbx 3e: 48 rex.W 3f: 81 .byte 0x81