GRED: Unable to relocate VQ 0x0 after dequeue, screwing up backlog GRED: Unable to relocate VQ 0x0 after dequeue, screwing up backlog GRED: Unable to relocate VQ 0x0 after dequeue, screwing up backlog GRED: Unable to relocate VQ 0x0 after dequeue, screwing up backlog INFO: task syz-executor.3:31931 blocked for more than 140 seconds. Not tainted 4.19.149-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D29472 31931 6519 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x8e5/0x22e0 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+0x123/0x1d0 fs/fuse/dev.c:505 fuse_simple_request+0x2d2/0x6f0 fs/fuse/dev.c:576 fuse_do_getattr+0x230/0xc40 fs/fuse/dir.c:927 fuse_update_get_attr fs/fuse/dir.c:960 [inline] fuse_getattr+0x2c1/0x380 fs/fuse/dir.c:1838 vfs_getattr_nosec+0xff/0x160 fs/stat.c:79 vfs_getattr fs/stat.c:116 [inline] vfs_statx+0x15a/0x210 fs/stat.c:189 vfs_stat include/linux/fs.h:3133 [inline] __do_sys_newstat fs/stat.c:337 [inline] __se_sys_newstat+0x96/0x120 fs/stat.c:333 do_syscall_64+0xf9/0x670 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45dea9 Code: Bad RIP value. RSP: 002b:00007f40cb2b6c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000004 RAX: ffffffffffffffda RBX: 0000000000035100 RCX: 000000000045dea9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000200004c0 RBP: 000000000118c000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bfd4 R13: 00007ffcdfedd65f R14: 00007f40cb2b79c0 R15: 000000000118bfd4 INFO: task syz-executor.3:31975 blocked for more than 140 seconds. Not tainted 4.19.149-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D29472 31975 6519 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x8e5/0x22e0 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+0x123/0x1d0 fs/fuse/dev.c:505 fuse_simple_request+0x2d2/0x6f0 fs/fuse/dev.c:576 fuse_do_getattr+0x230/0xc40 fs/fuse/dir.c:927 fuse_update_get_attr fs/fuse/dir.c:960 [inline] fuse_getattr+0x2c1/0x380 fs/fuse/dir.c:1838 vfs_getattr_nosec+0xff/0x160 fs/stat.c:79 vfs_getattr fs/stat.c:116 [inline] vfs_statx+0x15a/0x210 fs/stat.c:189 vfs_stat include/linux/fs.h:3133 [inline] __do_sys_newstat fs/stat.c:337 [inline] __se_sys_newstat+0x96/0x120 fs/stat.c:333 do_syscall_64+0xf9/0x670 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45dea9 Code: Bad RIP value. RSP: 002b:00007f40cb2d7c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000004 RAX: ffffffffffffffda RBX: 0000000000035100 RCX: 000000000045dea9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000200004c0 RBP: 000000000118bf58 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bf2c R13: 00007ffcdfedd65f R14: 00007f40cb2d89c0 R15: 000000000118bf2c INFO: task syz-executor.3:31991 blocked for more than 140 seconds. Not tainted 4.19.149-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D29472 31991 6519 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x8e5/0x22e0 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+0x123/0x1d0 fs/fuse/dev.c:505 fuse_simple_request+0x2d2/0x6f0 fs/fuse/dev.c:576 fuse_do_getattr+0x230/0xc40 fs/fuse/dir.c:927 fuse_update_get_attr fs/fuse/dir.c:960 [inline] fuse_getattr+0x2c1/0x380 fs/fuse/dir.c:1838 vfs_getattr_nosec+0xff/0x160 fs/stat.c:79 vfs_getattr fs/stat.c:116 [inline] vfs_statx+0x15a/0x210 fs/stat.c:189 vfs_stat include/linux/fs.h:3133 [inline] __do_sys_newstat fs/stat.c:337 [inline] __se_sys_newstat+0x96/0x120 fs/stat.c:333 do_syscall_64+0xf9/0x670 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45dea9 Code: Bad RIP value. RSP: 002b:00007f40cb2d7c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000004 RAX: ffffffffffffffda RBX: 0000000000035100 RCX: 000000000045dea9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000200004c0 RBP: 000000000118bf58 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bf2c R13: 00007ffcdfedd65f R14: 00007f40cb2d89c0 R15: 000000000118bf2c INFO: task syz-executor.3:32030 blocked for more than 140 seconds. Not tainted 4.19.149-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D29472 32030 6519 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x8e5/0x22e0 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+0x123/0x1d0 fs/fuse/dev.c:505 fuse_simple_request+0x2d2/0x6f0 fs/fuse/dev.c:576 fuse_do_getattr+0x230/0xc40 fs/fuse/dir.c:927 fuse_update_get_attr fs/fuse/dir.c:960 [inline] fuse_getattr+0x2c1/0x380 fs/fuse/dir.c:1838 vfs_getattr_nosec+0xff/0x160 fs/stat.c:79 vfs_getattr fs/stat.c:116 [inline] vfs_statx+0x15a/0x210 fs/stat.c:189 vfs_stat include/linux/fs.h:3133 [inline] __do_sys_newstat fs/stat.c:337 [inline] __se_sys_newstat+0x96/0x120 fs/stat.c:333 do_syscall_64+0xf9/0x670 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45dea9 Code: Bad RIP value. RSP: 002b:00007f40cb2d7c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000004 RAX: ffffffffffffffda RBX: 0000000000035100 RCX: 000000000045dea9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000200004c0 RBP: 000000000118bf58 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bf2c R13: 00007ffcdfedd65f R14: 00007f40cb2d89c0 R15: 000000000118bf2c Showing all locks held in the system: 1 lock held by khungtaskd/1095: #0: 000000005eefe144 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x291 kernel/locking/lockdep.c:4440 1 lock held by in:imklog/6183: #0: 00000000df7fc0c4 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xe3/0x100 fs/file.c:767 2 locks held by agetty/6419: #0: 00000000de76befc (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: 0000000044eee477 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x217/0x18c0 drivers/tty/n_tty.c:2154 2 locks held by syz-executor.1/24704: #0: 00000000e5841401 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: 0000000012476e34 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x217/0x18c0 drivers/tty/n_tty.c:2154 2 locks held by syz-executor.1/24808: #0: 00000000888c7823 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: 000000002bb1a6fc (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x217/0x18c0 drivers/tty/n_tty.c:2154 2 locks held by syz-executor.1/24850: #0: 000000001a668037 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: 00000000cffccb79 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x217/0x18c0 drivers/tty/n_tty.c:2154 2 locks held by syz-executor.1/24910: #0: 000000006ad1e5d7 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: 0000000025ee41f3 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x217/0x18c0 drivers/tty/n_tty.c:2154 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1095 Comm: khungtaskd Not tainted 4.19.149-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+0x22c/0x33e lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x18/0x3d lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1a6/0x1eb 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+0xa62/0x1020 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: 6185 Comm: rs:main Q:Reg Not tainted 4.19.149-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__sanitizer_cov_trace_pc+0x22/0x50 kernel/kcov.c:101 Code: 00 00 e9 39 ec ff ff 90 48 8b 34 24 65 48 8b 04 25 40 ee 01 00 65 8b 15 5c 1b 90 7e 81 e2 00 01 1f 00 75 2b 8b 90 e0 12 00 00 <83> fa 02 75 20 48 8b 88 e8 12 00 00 8b 80 e4 12 00 00 48 8b 11 48 RSP: 0018:ffff888084b3fa78 EFLAGS: 00000246 RAX: ffff8880a01f6140 RBX: 0000000000000b41 RCX: ffffffff839f6453 RDX: 0000000000000000 RSI: ffffffff818ce9c8 RDI: ffff888084b3fdb0 RBP: ffff88808340e7f8 R08: 0000000000000000 R09: 0000000000000394 R10: 0000000000000006 R11: 0000000000000003 R12: 0000000000000394 R13: 0000000000000394 R14: 0000000000071b41 R15: ffff888084b3fd90 FS: 00007f1c6b7e8700(0000) GS:ffff8880ae200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fbcd9f39000 CR3: 00000000a4996000 CR4: 00000000001426f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: generic_perform_write+0x2e8/0x4d0 mm/filemap.c:3189 __generic_file_write_iter+0x24b/0x610 mm/filemap.c:3295 ext4_file_write_iter+0x2fe/0xfb0 fs/ext4/file.c:272 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+0xf9/0x670 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f1c6e22c1cd Code: c2 20 00 00 75 10 b8 01 00 00 00 0f 05 48 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 ae fc ff ff 48 89 04 24 b8 01 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 f7 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:00007f1c6b7e7590 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f1c5c027fc0 RCX: 00007f1c6e22c1cd RDX: 0000000000000394 RSI: 00007f1c5c027fc0 RDI: 0000000000000009 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 00007f1c5c027d40 R13: 00007f1c6b7e75b0 R14: 000055680ee737c0 R15: 0000000000000394