bisecting fixing commit since 811218eceeaa7618652e1b8d11caeff67ab42072 building syzkaller on 624dad51316f9973e1349b6c71e789737d1e00d9 testing commit 811218eceeaa7618652e1b8d11caeff67ab42072 with gcc (GCC) 8.4.1 20210217 kernel signature: a9c12ef7d5fa57fe3f724daffeca187befa2f10b5b49dc6c330890bd8fad64dd run #0: crashed: INFO: task hung in blkdev_put run #1: crashed: INFO: task hung in truncate_inode_pages_range run #2: crashed: INFO: task hung in truncate_inode_pages_range run #3: crashed: INFO: task hung in truncate_inode_pages_range run #4: crashed: INFO: task hung in truncate_inode_pages_range run #5: crashed: INFO: task hung in truncate_inode_pages_range run #6: crashed: INFO: task hung in truncate_inode_pages_range run #7: crashed: INFO: task hung in truncate_inode_pages_range run #8: crashed: INFO: task hung in truncate_inode_pages_range run #9: crashed: INFO: task hung in truncate_inode_pages_range run #10: crashed: INFO: task hung in truncate_inode_pages_range run #11: crashed: INFO: task hung in truncate_inode_pages_range run #12: crashed: INFO: task hung in truncate_inode_pages_range run #13: crashed: INFO: task hung in truncate_inode_pages_range run #14: crashed: INFO: task hung in truncate_inode_pages_range run #15: crashed: INFO: task hung in truncate_inode_pages_range run #16: crashed: INFO: task hung in truncate_inode_pages_range run #17: crashed: INFO: task hung in truncate_inode_pages_range run #18: crashed: INFO: task hung in truncate_inode_pages_range run #19: crashed: INFO: task hung in truncate_inode_pages_range testing current HEAD 97a8651cadce7c2b7c4d8f108b392eff31fe2c08 testing commit 97a8651cadce7c2b7c4d8f108b392eff31fe2c08 with gcc (GCC) 8.4.1 20210217 kernel signature: 4f40c8356f8cc94f74be201cd0181f697ec5c92e67c91b74979f9796c517eaf7 run #0: crashed: INFO: task hung in nbd_ioctl run #1: crashed: INFO: task hung in blk_freeze_queue run #2: crashed: INFO: task hung in nbd_ioctl run #3: crashed: INFO: task hung in nbd_ioctl run #4: crashed: INFO: task hung in nbd_ioctl run #5: crashed: INFO: task hung in blk_freeze_queue run #6: crashed: INFO: task hung in nbd_ioctl run #7: crashed: INFO: task hung in nbd_ioctl run #8: crashed: INFO: task hung in nbd_ioctl run #9: crashed: INFO: task hung in blk_freeze_queue revisions tested: 2, total time: 32m19.494269741s (build: 16m49.281734207s, test: 14m58.183648568s) the crash still happens on HEAD commit msg: Linux 4.19.189 crash: INFO: task hung in blk_freeze_queue Bluetooth: hci2: command 0x0406 tx timeout Bluetooth: hci5: command 0x0406 tx timeout Bluetooth: hci0: command 0x0406 tx timeout Bluetooth: hci1: command 0x0406 tx timeout Bluetooth: hci4: command 0x0406 tx timeout INFO: task syz-executor.3:9900 blocked for more than 140 seconds. Not tainted 4.19.189-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D28712 9900 8482 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 blk_mq_freeze_queue_wait+0x105/0x220 block/blk-mq.c:152 blk_freeze_queue+0x3d/0x60 block/blk-mq.c:181 blk_mq_freeze_queue+0x9/0x10 block/blk-mq.c:190 nbd_add_socket+0x109/0x840 drivers/block/nbd.c:973 __nbd_ioctl drivers/block/nbd.c:1320 [inline] nbd_ioctl+0x4fd/0xb30 drivers/block/nbd.c:1387 __blkdev_driver_ioctl block/ioctl.c:303 [inline] blkdev_ioctl+0x7ea/0x1790 block/ioctl.c:601 block_ioctl+0xd7/0x130 fs/block_dev.c:1906 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0x196/0x10c0 fs/ioctl.c:688 ksys_ioctl+0x62/0x90 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:710 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x465b09 Code: Bad RIP value. RSP: 002b:00007f75a22c0188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056c008 RCX: 0000000000465b09 RDX: 0000000000000004 RSI: 000000000000ab00 RDI: 0000000000000003 RBP: 00000000004b069f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c008 R13: 00007ffcfd38236f R14: 00007f75a22c0300 R15: 0000000000022000 INFO: task syz-executor.3:9993 blocked for more than 140 seconds. Not tainted 4.19.189-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D29416 9993 8482 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3619 __mutex_lock_common kernel/locking/mutex.c:1005 [inline] __mutex_lock+0x4c3/0x1200 kernel/locking/mutex.c:1075 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1090 nbd_ioctl+0x12a/0xb30 drivers/block/nbd.c:1380 __blkdev_driver_ioctl block/ioctl.c:303 [inline] blkdev_ioctl+0x7ea/0x1790 block/ioctl.c:601 block_ioctl+0xd7/0x130 fs/block_dev.c:1906 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0x196/0x10c0 fs/ioctl.c:688 ksys_ioctl+0x62/0x90 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:710 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x465b09 Code: Bad RIP value. RSP: 002b:00007f75a229f188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056c0b0 RCX: 0000000000465b09 RDX: 0000000000000401 RSI: 000000000000ab09 RDI: 0000000000000006 RBP: 00000000004b069f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c0b0 R13: 00007ffcfd38236f R14: 00007f75a229f300 R15: 0000000000022000 INFO: task syz-executor.3:9995 blocked for more than 140 seconds. Not tainted 4.19.189-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D29496 9995 8482 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3619 __mutex_lock_common kernel/locking/mutex.c:1005 [inline] __mutex_lock+0x4c3/0x1200 kernel/locking/mutex.c:1075 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1090 nbd_ioctl+0x12a/0xb30 drivers/block/nbd.c:1380 __blkdev_driver_ioctl block/ioctl.c:303 [inline] blkdev_ioctl+0x7ea/0x1790 block/ioctl.c:601 block_ioctl+0xd7/0x130 fs/block_dev.c:1906 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0x196/0x10c0 fs/ioctl.c:688 ksys_ioctl+0x62/0x90 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:710 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x465b09 Code: Bad RIP value. RSP: 002b:00007f75a227e188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056c158 RCX: 0000000000465b09 RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000007 RBP: 00000000004b069f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c158 R13: 00007ffcfd38236f R14: 00007f75a227e300 R15: 0000000000022000 INFO: task syz-executor.3:9997 blocked for more than 140 seconds. Not tainted 4.19.189-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D29416 9997 8482 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3619 __mutex_lock_common kernel/locking/mutex.c:1005 [inline] __mutex_lock+0x4c3/0x1200 kernel/locking/mutex.c:1075 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1090 nbd_ioctl+0x12a/0xb30 drivers/block/nbd.c:1380 __blkdev_driver_ioctl block/ioctl.c:303 [inline] blkdev_ioctl+0x7ea/0x1790 block/ioctl.c:601 block_ioctl+0xd7/0x130 fs/block_dev.c:1906 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0x196/0x10c0 fs/ioctl.c:688 ksys_ioctl+0x62/0x90 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:710 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x465b09 Code: Bad RIP value. RSP: 002b:00007f75a225d188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056c200 RCX: 0000000000465b09 RDX: 0000240000000000 RSI: 000000000000ab07 RDI: 0000000000000008 RBP: 00000000004b069f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c200 R13: 00007ffcfd38236f R14: 00007f75a225d300 R15: 0000000000022000 INFO: task syz-executor.2:9938 blocked for more than 140 seconds. Not tainted 4.19.189-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D27864 9938 8481 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3619 __mutex_lock_common kernel/locking/mutex.c:1005 [inline] __mutex_lock+0x4c3/0x1200 kernel/locking/mutex.c:1075 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1090 nbd_start_device_ioctl drivers/block/nbd.c:1278 [inline] __nbd_ioctl drivers/block/nbd.c:1347 [inline] nbd_ioctl+0x2d6/0xb30 drivers/block/nbd.c:1387 __blkdev_driver_ioctl block/ioctl.c:303 [inline] blkdev_ioctl+0x7ea/0x1790 block/ioctl.c:601 block_ioctl+0xd7/0x130 fs/block_dev.c:1906 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0x196/0x10c0 fs/ioctl.c:688 ksys_ioctl+0x62/0x90 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:710 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x465b09 Code: 00 e9 30 ff ff ff 83 f9 77 75 26 48 83 b8 d8 00 00 00 00 7c e2 83 f9 72 75 10 80 78 19 00 74 0a b9 03 00 00 00 e9 0c ff ff ff <31> c9 e9 05 ff ff ff 83 f9 72 eb e2 e8 c6 35 00 00 e9 c1 fe ff ff RSP: 002b:00007f9aeae6d188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000465b09 RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000007 RBP: 00000000004b069f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007ffce277b9ff R14: 00007f9aeae6d300 R15: 0000000000022000 INFO: task syz-executor.2:9999 blocked for more than 140 seconds. Not tainted 4.19.189-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D29688 9999 8481 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 blk_mq_freeze_queue_wait+0x105/0x220 block/blk-mq.c:152 blk_freeze_queue+0x3d/0x60 block/blk-mq.c:181 blk_mq_freeze_queue+0x9/0x10 block/blk-mq.c:190 nbd_add_socket+0x109/0x840 drivers/block/nbd.c:973 __nbd_ioctl drivers/block/nbd.c:1320 [inline] nbd_ioctl+0x4fd/0xb30 drivers/block/nbd.c:1387 __blkdev_driver_ioctl block/ioctl.c:303 [inline] blkdev_ioctl+0x7ea/0x1790 block/ioctl.c:601 block_ioctl+0xd7/0x130 fs/block_dev.c:1906 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0x196/0x10c0 fs/ioctl.c:688 ksys_ioctl+0x62/0x90 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:710 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x465b09 Code: 00 e9 30 ff ff ff 83 f9 77 75 26 48 83 b8 d8 00 00 00 00 7c e2 83 f9 72 75 10 80 78 19 00 74 0a b9 03 00 00 00 e9 0c ff ff ff <31> c9 e9 05 ff ff ff 83 f9 72 eb e2 e8 c6 35 00 00 e9 c1 fe ff ff RSP: 002b:00007f9aeae2b188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056c0b0 RCX: 0000000000465b09 RDX: 0000000000000004 RSI: 000000000000ab00 RDI: 0000000000000003 RBP: 00000000004b069f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c0b0 R13: 00007ffce277b9ff R14: 00007f9aeae2b300 R15: 0000000000022000 INFO: task syz-executor.2:10000 blocked for more than 140 seconds. Not tainted 4.19.189-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D29368 10000 8481 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3619 __mutex_lock_common kernel/locking/mutex.c:1005 [inline] __mutex_lock+0x4c3/0x1200 kernel/locking/mutex.c:1075 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1090 nbd_ioctl+0x12a/0xb30 drivers/block/nbd.c:1380 __blkdev_driver_ioctl block/ioctl.c:303 [inline] blkdev_ioctl+0x7ea/0x1790 block/ioctl.c:601 block_ioctl+0xd7/0x130 fs/block_dev.c:1906 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0x196/0x10c0 fs/ioctl.c:688 ksys_ioctl+0x62/0x90 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:710 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x465b09 Code: 00 e9 30 ff ff ff 83 f9 77 75 26 48 83 b8 d8 00 00 00 00 7c e2 83 f9 72 75 10 80 78 19 00 74 0a b9 03 00 00 00 e9 0c ff ff ff <31> c9 e9 05 ff ff ff 83 f9 72 eb e2 e8 c6 35 00 00 e9 c1 fe ff ff RSP: 002b:00007f9aeae0a188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056c158 RCX: 0000000000465b09 RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000007 RBP: 00000000004b069f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c158 R13: 00007ffce277b9ff R14: 00007f9aeae0a300 R15: 0000000000022000 INFO: task syz-executor.2:10001 blocked for more than 140 seconds. Not tainted 4.19.189-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D29496 10001 8481 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3619 __mutex_lock_common kernel/locking/mutex.c:1005 [inline] __mutex_lock+0x4c3/0x1200 kernel/locking/mutex.c:1075 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1090 nbd_ioctl+0x12a/0xb30 drivers/block/nbd.c:1380 __blkdev_driver_ioctl block/ioctl.c:303 [inline] blkdev_ioctl+0x7ea/0x1790 block/ioctl.c:601 block_ioctl+0xd7/0x130 fs/block_dev.c:1906 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0x196/0x10c0 fs/ioctl.c:688 ksys_ioctl+0x62/0x90 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:710 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x465b09 Code: 00 e9 30 ff ff ff 83 f9 77 75 26 48 83 b8 d8 00 00 00 00 7c e2 83 f9 72 75 10 80 78 19 00 74 0a b9 03 00 00 00 e9 0c ff ff ff <31> c9 e9 05 ff ff ff 83 f9 72 eb e2 e8 c6 35 00 00 e9 c1 fe ff ff RSP: 002b:00007f9aeade9188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056c200 RCX: 0000000000465b09 RDX: 0000240000000000 RSI: 000000000000ab07 RDI: 0000000000000008 RBP: 00000000004b069f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c200 R13: 00007ffce277b9ff R14: 00007f9aeade9300 R15: 0000000000022000 INFO: task syz-executor.0:9980 blocked for more than 140 seconds. Not tainted 4.19.189-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D28632 9980 8476 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 blk_mq_freeze_queue_wait+0x105/0x220 block/blk-mq.c:152 blk_freeze_queue+0x3d/0x60 block/blk-mq.c:181 blk_mq_freeze_queue+0x9/0x10 block/blk-mq.c:190 nbd_add_socket+0x109/0x840 drivers/block/nbd.c:973 __nbd_ioctl drivers/block/nbd.c:1320 [inline] nbd_ioctl+0x4fd/0xb30 drivers/block/nbd.c:1387 __blkdev_driver_ioctl block/ioctl.c:303 [inline] blkdev_ioctl+0x7ea/0x1790 block/ioctl.c:601 block_ioctl+0xd7/0x130 fs/block_dev.c:1906 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0x196/0x10c0 fs/ioctl.c:688 ksys_ioctl+0x62/0x90 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:710 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x465b09 Code: 00 e9 30 ff ff ff 83 f9 77 75 26 48 83 b8 d8 00 00 00 00 7c e2 83 f9 72 75 10 80 78 19 00 74 0a b9 03 00 00 00 e9 0c ff ff ff <31> c9 e9 05 ff ff ff 83 f9 72 eb e2 e8 c6 35 00 00 e9 c1 fe ff ff RSP: 002b:00007f47dffd9188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056c008 RCX: 0000000000465b09 RDX: 0000000000000004 RSI: 000000000000ab00 RDI: 0000000000000003 RBP: 00000000004b069f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c008 R13: 00007ffca10fa8ff R14: 00007f47dffd9300 R15: 0000000000022000 INFO: task syz-executor.0:10007 blocked for more than 140 seconds. Not tainted 4.19.189-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D29416 10007 8476 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3619 __mutex_lock_common kernel/locking/mutex.c:1005 [inline] __mutex_lock+0x4c3/0x1200 kernel/locking/mutex.c:1075 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1090 nbd_ioctl+0x12a/0xb30 drivers/block/nbd.c:1380 __blkdev_driver_ioctl block/ioctl.c:303 [inline] blkdev_ioctl+0x7ea/0x1790 block/ioctl.c:601 block_ioctl+0xd7/0x130 fs/block_dev.c:1906 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0x196/0x10c0 fs/ioctl.c:688 ksys_ioctl+0x62/0x90 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:710 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x465b09 Code: 00 e9 30 ff ff ff 83 f9 77 75 26 48 83 b8 d8 00 00 00 00 7c e2 83 f9 72 75 10 80 78 19 00 74 0a b9 03 00 00 00 e9 0c ff ff ff <31> c9 e9 05 ff ff ff 83 f9 72 eb e2 e8 c6 35 00 00 e9 c1 fe ff ff RSP: 002b:00007f47dffb8188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056c0b0 RCX: 0000000000465b09 RDX: 0000000000000401 RSI: 000000000000ab09 RDI: 0000000000000006 RBP: 00000000004b069f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c0b0 R13: 00007ffca10fa8ff R14: 00007f47dffb8300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1571: #0: 00000000feb84a4d (rcu_read_lock){....}, at: debug_show_all_locks+0x5b/0x27a kernel/locking/lockdep.c:4443 1 lock held by in:imklog/7794: #0: 0000000071ccba11 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xa7/0xd0 fs/file.c:767 1 lock held by syz-executor.3/9900: #0: 00000000f2097885 (&nbd->config_lock){+.+.}, at: nbd_ioctl+0x12a/0xb30 drivers/block/nbd.c:1380 1 lock held by syz-executor.3/9993: #0: 00000000f2097885 (&nbd->config_lock){+.+.}, at: nbd_ioctl+0x12a/0xb30 drivers/block/nbd.c:1380 1 lock held by syz-executor.3/9995: #0: 00000000f2097885 (&nbd->config_lock){+.+.}, at: nbd_ioctl+0x12a/0xb30 drivers/block/nbd.c:1380 1 lock held by syz-executor.3/9997: #0: 00000000f2097885 (&nbd->config_lock){+.+.}, at: nbd_ioctl+0x12a/0xb30 drivers/block/nbd.c:1380 1 lock held by syz-executor.2/9938: #0: 0000000001c63c64 (&nbd->config_lock){+.+.}, at: nbd_start_device_ioctl drivers/block/nbd.c:1278 [inline] #0: 0000000001c63c64 (&nbd->config_lock){+.+.}, at: __nbd_ioctl drivers/block/nbd.c:1347 [inline] #0: 0000000001c63c64 (&nbd->config_lock){+.+.}, at: nbd_ioctl+0x2d6/0xb30 drivers/block/nbd.c:1387 1 lock held by syz-executor.2/9999: #0: 0000000001c63c64 (&nbd->config_lock){+.+.}, at: nbd_ioctl+0x12a/0xb30 drivers/block/nbd.c:1380 1 lock held by syz-executor.2/10000: #0: 0000000001c63c64 (&nbd->config_lock){+.+.}, at: nbd_ioctl+0x12a/0xb30 drivers/block/nbd.c:1380 1 lock held by syz-executor.2/10001: #0: 0000000001c63c64 (&nbd->config_lock){+.+.}, at: nbd_ioctl+0x12a/0xb30 drivers/block/nbd.c:1380 1 lock held by syz-executor.0/9980: #0: 00000000d0beec08 (&nbd->config_lock){+.+.}, at: nbd_ioctl+0x12a/0xb30 drivers/block/nbd.c:1380 1 lock held by syz-executor.0/10007: #0: 00000000d0beec08 (&nbd->config_lock){+.+.}, at: nbd_ioctl+0x12a/0xb30 drivers/block/nbd.c:1380 1 lock held by syz-executor.0/10009: #0: 00000000d0beec08 (&nbd->config_lock){+.+.}, at: nbd_ioctl+0x12a/0xb30 drivers/block/nbd.c:1380 1 lock held by syz-executor.0/10013: #0: 00000000d0beec08 (&nbd->config_lock){+.+.}, at: nbd_ioctl+0x12a/0xb30 drivers/block/nbd.c:1380 1 lock held by syz-executor.4/9990: #0: 000000006dc47051 (&nbd->config_lock){+.+.}, at: nbd_ioctl+0x12a/0xb30 drivers/block/nbd.c:1380 1 lock held by syz-executor.4/9994: #0: 000000006dc47051 (&nbd->config_lock){+.+.}, at: nbd_ioctl+0x12a/0xb30 drivers/block/nbd.c:1380 1 lock held by syz-executor.4/9996: #0: 000000006dc47051 (&nbd->config_lock){+.+.}, at: nbd_ioctl+0x12a/0xb30 drivers/block/nbd.c:1380 1 lock held by syz-executor.4/9998: #0: 000000006dc47051 (&nbd->config_lock){+.+.}, at: nbd_ioctl+0x12a/0xb30 drivers/block/nbd.c:1380 1 lock held by syz-executor.4/10020: #0: 000000006dc47051 (&nbd->config_lock){+.+.}, at: nbd_ioctl+0x12a/0xb30 drivers/block/nbd.c:1380 1 lock held by syz-executor.4/10021: #0: 000000006dc47051 (&nbd->config_lock){+.+.}, at: nbd_ioctl+0x12a/0xb30 drivers/block/nbd.c:1380 1 lock held by syz-executor.4/10022: #0: 000000006dc47051 (&nbd->config_lock){+.+.}, at: nbd_ioctl+0x12a/0xb30 drivers/block/nbd.c:1380 1 lock held by syz-executor.4/10023: #0: 000000006dc47051 (&nbd->config_lock){+.+.}, at: nbd_ioctl+0x12a/0xb30 drivers/block/nbd.c:1380 1 lock held by syz-executor.1/10005: #0: 0000000064b49174 (&nbd->config_lock){+.+.}, at: nbd_ioctl+0x12a/0xb30 drivers/block/nbd.c:1380 1 lock held by syz-executor.1/10006: #0: 0000000064b49174 (&nbd->config_lock){+.+.}, at: nbd_ioctl+0x12a/0xb30 drivers/block/nbd.c:1380 1 lock held by syz-executor.1/10008: #0: 0000000064b49174 (&nbd->config_lock){+.+.}, at: nbd_ioctl+0x12a/0xb30 drivers/block/nbd.c:1380 1 lock held by syz-executor.1/10010: #0: 0000000064b49174 (&nbd->config_lock){+.+.}, at: nbd_ioctl+0x12a/0xb30 drivers/block/nbd.c:1380 1 lock held by syz-executor.1/10025: #0: 0000000064b49174 (&nbd->config_lock){+.+.}, at: nbd_ioctl+0x12a/0xb30 drivers/block/nbd.c:1380 1 lock held by syz-executor.1/10026: #0: 0000000064b49174 (&nbd->config_lock){+.+.}, at: nbd_ioctl+0x12a/0xb30 drivers/block/nbd.c:1380 1 lock held by syz-executor.1/10027: #0: 0000000064b49174 (&nbd->config_lock){+.+.}, at: nbd_ioctl+0x12a/0xb30 drivers/block/nbd.c:1380 1 lock held by syz-executor.1/10028: #0: 0000000064b49174 (&nbd->config_lock){+.+.}, at: nbd_ioctl+0x12a/0xb30 drivers/block/nbd.c:1380 1 lock held by syz-executor.5/10015: #0: 00000000706550db (&nbd->config_lock){+.+.}, at: nbd_ioctl+0x12a/0xb30 drivers/block/nbd.c:1380 1 lock held by syz-executor.5/10016: #0: 00000000706550db (&nbd->config_lock){+.+.}, at: nbd_ioctl+0x12a/0xb30 drivers/block/nbd.c:1380 1 lock held by syz-executor.5/10017: #0: 00000000706550db (&nbd->config_lock){+.+.}, at: nbd_ioctl+0x12a/0xb30 drivers/block/nbd.c:1380 1 lock held by syz-executor.5/10018: #0: 00000000706550db (&nbd->config_lock){+.+.}, at: nbd_ioctl+0x12a/0xb30 drivers/block/nbd.c:1380 1 lock held by syz-executor.5/10030: #0: 00000000706550db (&nbd->config_lock){+.+.}, at: nbd_ioctl+0x12a/0xb30 drivers/block/nbd.c:1380 1 lock held by syz-executor.5/10031: #0: 00000000706550db (&nbd->config_lock){+.+.}, at: nbd_ioctl+0x12a/0xb30 drivers/block/nbd.c:1380 1 lock held by syz-executor.5/10032: #0: 00000000706550db (&nbd->config_lock){+.+.}, at: nbd_ioctl+0x12a/0xb30 drivers/block/nbd.c:1380 1 lock held by syz-executor.5/10033: #0: 00000000706550db (&nbd->config_lock){+.+.}, at: nbd_ioctl+0x12a/0xb30 drivers/block/nbd.c:1380 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1571 Comm: khungtaskd Not tainted 4.19.189-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+0x17c/0x226 lib/dump_stack.c:118 nmi_cpu_backtrace.cold.0+0x3c/0x78 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0xf6/0x120 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline] watchdog+0x5c3/0xb40 kernel/hung_task.c:287 kthread+0x347/0x410 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: 37 Comm: kworker/u4:2 Not tainted 4.19.189-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_nc_worker RIP: 0010:hlock_class kernel/locking/lockdep.c:145 [inline] RIP: 0010:mark_lock+0x3a/0x12f0 kernel/locking/lockdep.c:3106 Code: df 48 89 e5 41 57 49 89 ff 41 56 41 89 d6 4c 89 c2 41 55 48 c1 ea 03 41 bd 01 00 00 00 41 54 41 d3 e5 53 48 89 f3 48 83 ec 20 <0f> b6 04 02 84 c0 74 08 3c 01 0f 8e af 04 00 00 0f b7 43 20 66 a9 RSP: 0018:ffff8880b507fb50 EFLAGS: 00000086 RAX: dffffc0000000000 RBX: ffff8880b506cb08 RCX: 0000000000000006 RDX: 1ffff11016a0d965 RSI: ffff8880b506cb08 RDI: ffff8880b506c280 RBP: ffff8880b507fb98 R08: ffff8880b506cb28 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880b506cb08 R13: 0000000000000040 R14: 0000000000000006 R15: ffff8880b506c280 FS: 0000000000000000(0000) GS:ffff8880ba200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f915dc5e000 CR3: 00000000a1248000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: mark_held_locks+0xc7/0x130 kernel/locking/lockdep.c:2810 __trace_hardirqs_on_caller kernel/locking/lockdep.c:2839 [inline] lockdep_hardirqs_on+0x3bb/0x5b0 kernel/locking/lockdep.c:2884 trace_hardirqs_on+0x28/0x190 kernel/trace/trace_preemptirq.c:30 __local_bh_enable_ip+0x160/0x250 kernel/softirq.c:194 __raw_spin_unlock_bh include/linux/spinlock_api_smp.h:176 [inline] _raw_spin_unlock_bh+0x30/0x40 kernel/locking/spinlock.c:200 spin_unlock_bh include/linux/spinlock.h:374 [inline] batadv_nc_purge_paths+0x1c5/0x2c0 net/batman-adv/network-coding.c:482 batadv_nc_worker+0x1f3/0x630 net/batman-adv/network-coding.c:731 process_one_work+0x7b9/0x15a0 kernel/workqueue.c:2152 worker_thread+0x85/0xb60 kernel/workqueue.c:2295 kthread+0x347/0x410 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415