EXT4-fs (loop1): VFS: Can't find ext4 filesystem ====================================================== WARNING: possible circular locking dependency detected 4.14.297-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.3/14694 is trying to acquire lock: ("%s"hdev->name#2){+.+.}, at: [] start_flush_work kernel/workqueue.c:2861 [inline] ("%s"hdev->name#2){+.+.}, at: [] flush_work+0x387/0x770 kernel/workqueue.c:2893 but task is already holding lock: (&hdev->lock){+.+.}, at: [] hci_dev_do_close+0x264/0xd80 net/bluetooth/hci_core.c:1628 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&hdev->lock){+.+.}: __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893 hci_cc_write_scan_enable net/bluetooth/hci_event.c:375 [inline] hci_cmd_complete_evt+0x4d34/0xb490 net/bluetooth/hci_event.c:2831 hci_event_packet+0x21ce/0x7510 net/bluetooth/hci_event.c:5353 hci_rx_work+0x427/0xb40 net/bluetooth/hci_core.c:4266 process_one_work+0x793/0x14a0 kernel/workqueue.c:2117 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2251 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:406 -> #1 ((&hdev->rx_work)){+.+.}: process_one_work+0x736/0x14a0 kernel/workqueue.c:2093 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2251 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:406 -> #0 ("%s"hdev->name#2){+.+.}: lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998 start_flush_work kernel/workqueue.c:2862 [inline] flush_work+0x3ac/0x770 kernel/workqueue.c:2893 __cancel_work_timer+0x321/0x460 kernel/workqueue.c:2965 hci_conn_del+0x52/0x6f0 net/bluetooth/hci_conn.c:575 hci_conn_hash_flush+0x19c/0x260 net/bluetooth/hci_conn.c:1394 hci_dev_do_close+0x57d/0xd80 net/bluetooth/hci_core.c:1641 hci_rfkill_set_block+0xaf/0x120 net/bluetooth/hci_core.c:2071 rfkill_set_block+0x1b2/0x4a0 net/rfkill/core.c:337 rfkill_fop_write+0x1b6/0x3c0 net/rfkill/core.c:1233 do_loop_readv_writev fs/read_write.c:698 [inline] do_loop_readv_writev fs/read_write.c:682 [inline] do_iter_write+0x3da/0x550 fs/read_write.c:956 vfs_writev+0x125/0x290 fs/read_write.c:999 do_writev+0xfc/0x2c0 fs/read_write.c:1034 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x5e/0xd3 other info that might help us debug this: Chain exists of: "%s"hdev->name#2 --> (&hdev->rx_work) --> &hdev->lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&hdev->lock); lock((&hdev->rx_work)); lock(&hdev->lock); lock("%s"hdev->name#2); *** DEADLOCK *** 3 locks held by syz-executor.3/14694: #0: (rfkill_global_mutex){+.+.}, at: [] rfkill_fop_write+0xbf/0x3c0 net/rfkill/core.c:1225 #1: (&hdev->req_lock){+.+.}, at: [] hci_dev_do_close+0xa8/0xd80 net/bluetooth/hci_core.c:1589 #2: (&hdev->lock){+.+.}, at: [] hci_dev_do_close+0x264/0xd80 net/bluetooth/hci_core.c:1628 stack backtrace: CPU: 0 PID: 14694 Comm: syz-executor.3 Not tainted 4.14.297-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 print_circular_bug.constprop.0.cold+0x2d7/0x41e kernel/locking/lockdep.c:1258 check_prev_add kernel/locking/lockdep.c:1905 [inline] check_prevs_add kernel/locking/lockdep.c:2022 [inline] validate_chain kernel/locking/lockdep.c:2464 [inline] __lock_acquire+0x2e0e/0x3f20 kernel/locking/lockdep.c:3491 lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998 start_flush_work kernel/workqueue.c:2862 [inline] flush_work+0x3ac/0x770 kernel/workqueue.c:2893 __cancel_work_timer+0x321/0x460 kernel/workqueue.c:2965 hci_conn_del+0x52/0x6f0 net/bluetooth/hci_conn.c:575 hci_conn_hash_flush+0x19c/0x260 net/bluetooth/hci_conn.c:1394 hci_dev_do_close+0x57d/0xd80 net/bluetooth/hci_core.c:1641 hci_rfkill_set_block+0xaf/0x120 net/bluetooth/hci_core.c:2071 rfkill_set_block+0x1b2/0x4a0 net/rfkill/core.c:337 rfkill_fop_write+0x1b6/0x3c0 net/rfkill/core.c:1233 do_loop_readv_writev fs/read_write.c:698 [inline] do_loop_readv_writev fs/read_write.c:682 [inline] do_iter_write+0x3da/0x550 fs/read_write.c:956 vfs_writev+0x125/0x290 fs/read_write.c:999 do_writev+0xfc/0x2c0 fs/read_write.c:1034 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x5e/0xd3 EXT4-fs (loop2): VFS: Can't find ext4 filesystem EXT4-fs (loop4): VFS: Can't find ext4 filesystem EXT4-fs (loop5): VFS: Can't find ext4 filesystem EXT4-fs (loop1): VFS: Can't find ext4 filesystem EXT4-fs (loop5): VFS: Can't find ext4 filesystem EXT4-fs (loop4): VFS: Can't find ext4 filesystem EXT4-fs (loop2): VFS: Can't find ext4 filesystem MTD: Attempt to mount non-MTD device "/dev/loop2" romfs: Mounting image 'rom 5f663c08' through the block layer audit: type=1800 audit(1667454585.860:67): pid=14904 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed" comm="syz-executor.2" name="file0" dev="loop2" ino=128 res=0 MTD: Attempt to mount non-MTD device "/dev/loop2" MTD: Attempt to mount non-MTD device "/dev/loop1" romfs: Mounting image 'rom 5f663c08' through the block layer romfs: Mounting image 'rom 5f663c08' through the block layer audit: type=1800 audit(1667454586.100:68): pid=14934 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed" comm="syz-executor.2" name="file0" dev="loop2" ino=128 res=0 audit: type=1800 audit(1667454586.100:69): pid=14938 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed" comm="syz-executor.1" name="file0" dev="loop1" ino=128 res=0 MTD: Attempt to mount non-MTD device "/dev/loop2" MTD: Attempt to mount non-MTD device "/dev/loop1" romfs: Mounting image 'rom 5f663c08' through the block layer audit: type=1800 audit(1667454586.340:70): pid=14967 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed" comm="syz-executor.2" name="file0" dev="loop2" ino=128 res=0 romfs: Mounting image 'rom 5f663c08' through the block layer MTD: Attempt to mount non-MTD device "/dev/loop2" romfs: Mounting image 'rom 5f663c08' through the block layer audit: type=1800 audit(1667454586.580:71): pid=14995 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed" comm="syz-executor.2" name="file0" dev="loop2" ino=128 res=0 MTD: Attempt to mount non-MTD device "/dev/loop1" romfs: Mounting image 'rom 5f663c08' through the block layer audit: type=1800 audit(1667454586.720:72): pid=15012 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed" comm="syz-executor.1" name="file0" dev="loop1" ino=128 res=0 kvm: pic: non byte read kvm: pic: level sensitive irq not supported kvm: pic: non byte read kvm: pic: level sensitive irq not supported kvm: pic: non byte read kvm: pic: level sensitive irq not supported kvm: pic: non byte read kvm: pic: level sensitive irq not supported kvm: pic: non byte read kvm: pic: level sensitive irq not supported kvm: pic: non byte read SQUASHFS error: lzo decompression failed, data probably corrupt SQUASHFS error: squashfs_read_data failed to read block 0x60 SQUASHFS error: Unable to read fragment cache entry [60] kvm: pic: non byte read SQUASHFS error: Unable to read page, block 60, size 1f kvm: pic: level sensitive irq not supported kvm: pic: non byte read SQUASHFS error: Unable to read fragment cache entry [60] kvm: pic: level sensitive irq not supported kvm: pic: non byte read SQUASHFS error: Unable to read page, block 60, size 1f audit: type=1800 audit(1667454587.500:73): pid=15085 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed" comm="syz-executor.5" name="file1" dev="loop5" ino=5 res=0 kvm: pic: level sensitive irq not supported kvm: pic: non byte read kvm: pic: level sensitive irq not supported kvm: pic: level sensitive irq not supported SQUASHFS error: lzo decompression failed, data probably corrupt SQUASHFS error: squashfs_read_data failed to read block 0x60 SQUASHFS error: Unable to read fragment cache entry [60] SQUASHFS error: Unable to read page, block 60, size 1f SQUASHFS error: Unable to read fragment cache entry [60] SQUASHFS error: Unable to read page, block 60, size 1f audit: type=1800 audit(1667454588.330:74): pid=15150 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed" comm="syz-executor.5" name="file1" dev="loop5" ino=5 res=0 SQUASHFS error: lzo decompression failed, data probably corrupt SQUASHFS error: squashfs_read_data failed to read block 0x60 SQUASHFS error: Unable to read fragment cache entry [60] SQUASHFS error: Unable to read page, block 60, size 1f SQUASHFS error: lzo decompression failed, data probably corrupt SQUASHFS error: Unable to read fragment cache entry [60] SQUASHFS error: squashfs_read_data failed to read block 0x60 SQUASHFS error: Unable to read page, block 60, size 1f SQUASHFS error: Unable to read fragment cache entry [60] SQUASHFS error: Unable to read page, block 60, size 1f SQUASHFS error: Unable to read fragment cache entry [60] SQUASHFS error: Unable to read page, block 60, size 1f audit: type=1800 audit(1667454588.420:75): pid=15164 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed" comm="syz-executor.2" name="file1" dev="loop2" ino=5 res=0 audit: type=1800 audit(1667454588.440:76): pid=15158 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed" comm="syz-executor.4" name="file1" dev="loop4" ino=5 res=0 SQUASHFS error: lzo decompression failed, data probably corrupt SQUASHFS error: squashfs_read_data failed to read block 0x60 SQUASHFS error: Unable to read fragment cache entry [60] SQUASHFS error: Unable to read page, block 60, size 1f SQUASHFS error: Unable to read fragment cache entry [60] SQUASHFS error: Unable to read page, block 60, size 1f SQUASHFS error: lzo decompression failed, data probably corrupt SQUASHFS error: lzo decompression failed, data probably corrupt SQUASHFS error: squashfs_read_data failed to read block 0x60 SQUASHFS error: squashfs_read_data failed to read block 0x60 SQUASHFS error: Unable to read fragment cache entry [60] SQUASHFS error: Unable to read fragment cache entry [60] SQUASHFS error: Unable to read page, block 60, size 1f SQUASHFS error: Unable to read page, block 60, size 1f SQUASHFS error: Unable to read fragment cache entry [60] SQUASHFS error: Unable to read fragment cache entry [60] SQUASHFS error: Unable to read page, block 60, size 1f SQUASHFS error: Unable to read page, block 60, size 1f SQUASHFS error: lzo decompression failed, data probably corrupt SQUASHFS error: squashfs_read_data failed to read block 0x60 SQUASHFS error: Unable to read fragment cache entry [60] SQUASHFS error: Unable to read page, block 60, size 1f SQUASHFS error: Unable to read fragment cache entry [60] SQUASHFS error: Unable to read page, block 60, size 1f SQUASHFS error: lzo decompression failed, data probably corrupt SQUASHFS error: squashfs_read_data failed to read block 0x60 SQUASHFS error: Unable to read fragment cache entry [60] SQUASHFS error: lzo decompression failed, data probably corrupt SQUASHFS error: Unable to read page, block 60, size 1f SQUASHFS error: squashfs_read_data failed to read block 0x60 SQUASHFS error: Unable to read fragment cache entry [60] SQUASHFS error: Unable to read fragment cache entry [60] SQUASHFS error: Unable to read page, block 60, size 1f SQUASHFS error: Unable to read fragment cache entry [60] SQUASHFS error: Unable to read page, block 60, size 1f SQUASHFS error: Unable to read page, block 60, size 1f input: syz0 as /devices/virtual/input/input5 9p: Uknown uid 18446744073709551615 9p: Uknown uid 18446744073709551615 9p: Uknown uid 18446744073709551615 9p: Uknown uid 18446744073709551615 input: syz0 as /devices/virtual/input/input6 input: syz0 as /devices/virtual/input/input7 input: syz0 as /devices/virtual/input/input8 input: syz0 as /devices/virtual/input/input9 input: syz0 as /devices/virtual/input/input10 input: syz0 as /devices/virtual/input/input11