audit: type=1400 audit(2000000225.036:531): avc: denied { map } for pid=10884 comm="syz-executor.1" path="/dev/usbmon0" dev="devtmpfs" ino=15381 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:usbmon_device_t:s0 tclass=chr_file permissive=1 ====================================================== WARNING: possible circular locking dependency detected 4.14.156-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.1/10885 is trying to acquire lock: (&rp->fetch_lock){+.+.}, at: [] mon_bin_vma_fault+0x6f/0x280 drivers/usb/mon/mon_bin.c:1236 but task is already holding lock: (&mm->mmap_sem){++++}, at: [] __mm_populate+0x1e5/0x2c0 mm/gup.c:1259 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&mm->mmap_sem){++++}: lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3994 __might_fault mm/memory.c:4584 [inline] __might_fault+0x143/0x1d0 mm/memory.c:4569 _copy_to_user+0x2c/0xd0 lib/usercopy.c:25 copy_to_user include/linux/uaccess.h:155 [inline] mon_bin_read+0x2fb/0x5e0 drivers/usb/mon/mon_bin.c:825 do_loop_readv_writev fs/read_write.c:695 [inline] do_loop_readv_writev fs/read_write.c:682 [inline] do_iter_read+0x3e2/0x5b0 fs/read_write.c:919 vfs_readv+0xd3/0x130 fs/read_write.c:981 do_readv+0x10a/0x2d0 fs/read_write.c:1014 SYSC_readv fs/read_write.c:1101 [inline] SyS_readv+0x28/0x30 fs/read_write.c:1098 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 -> #0 (&rp->fetch_lock){+.+.}: check_prev_add kernel/locking/lockdep.c:1901 [inline] check_prevs_add kernel/locking/lockdep.c:2018 [inline] validate_chain kernel/locking/lockdep.c:2460 [inline] __lock_acquire+0x2cb3/0x4620 kernel/locking/lockdep.c:3487 lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3994 __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xe8/0x1470 kernel/locking/mutex.c:893 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908 mon_bin_vma_fault+0x6f/0x280 drivers/usb/mon/mon_bin.c:1236 __do_fault+0x104/0x390 mm/memory.c:3223 do_cow_fault mm/memory.c:3662 [inline] do_fault mm/memory.c:3761 [inline] handle_pte_fault mm/memory.c:3989 [inline] __handle_mm_fault+0xde1/0x3470 mm/memory.c:4113 handle_mm_fault+0x293/0x7c0 mm/memory.c:4150 faultin_page mm/gup.c:514 [inline] __get_user_pages+0x465/0x1220 mm/gup.c:714 populate_vma_page_range+0x18e/0x230 mm/gup.c:1231 __mm_populate+0x198/0x2c0 mm/gup.c:1279 mm_populate include/linux/mm.h:2182 [inline] vm_mmap_pgoff+0x1be/0x1d0 mm/util.c:338 SYSC_mmap_pgoff mm/mmap.c:1551 [inline] SyS_mmap_pgoff+0x3ca/0x520 mm/mmap.c:1509 SYSC_mmap arch/x86/kernel/sys_x86_64.c:100 [inline] SyS_mmap+0x16/0x20 arch/x86/kernel/sys_x86_64.c:91 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&mm->mmap_sem); lock(&rp->fetch_lock); lock(&mm->mmap_sem); lock(&rp->fetch_lock); *** DEADLOCK *** 1 lock held by syz-executor.1/10885: #0: (&mm->mmap_sem){++++}, at: [] __mm_populate+0x1e5/0x2c0 mm/gup.c:1259 stack backtrace: CPU: 0 PID: 10885 Comm: syz-executor.1 Not tainted 4.14.156-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x142/0x197 lib/dump_stack.c:58 print_circular_bug.isra.0.cold+0x1cc/0x28f kernel/locking/lockdep.c:1258 check_prev_add kernel/locking/lockdep.c:1901 [inline] check_prevs_add kernel/locking/lockdep.c:2018 [inline] validate_chain kernel/locking/lockdep.c:2460 [inline] __lock_acquire+0x2cb3/0x4620 kernel/locking/lockdep.c:3487 lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3994 __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xe8/0x1470 kernel/locking/mutex.c:893 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908 mon_bin_vma_fault+0x6f/0x280 drivers/usb/mon/mon_bin.c:1236 __do_fault+0x104/0x390 mm/memory.c:3223 do_cow_fault mm/memory.c:3662 [inline] do_fault mm/memory.c:3761 [inline] handle_pte_fault mm/memory.c:3989 [inline] __handle_mm_fault+0xde1/0x3470 mm/memory.c:4113 handle_mm_fault+0x293/0x7c0 mm/memory.c:4150 faultin_page mm/gup.c:514 [inline] __get_user_pages+0x465/0x1220 mm/gup.c:714 populate_vma_page_range+0x18e/0x230 mm/gup.c:1231 __mm_populate+0x198/0x2c0 mm/gup.c:1279 mm_populate include/linux/mm.h:2182 [inline] vm_mmap_pgoff+0x1be/0x1d0 mm/util.c:338 SYSC_mmap_pgoff mm/mmap.c:1551 [inline] SyS_mmap_pgoff+0x3ca/0x520 mm/mmap.c:1509 SYSC_mmap arch/x86/kernel/sys_x86_64.c:100 [inline] SyS_mmap+0x16/0x20 arch/x86/kernel/sys_x86_64.c:91 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45a649 RSP: 002b:00007f7997854c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 000000000045a649 RDX: 0000000001000002 RSI: 0000000000400300 RDI: 0000000020a05000 RBP: 000000000075bf20 R08: 0000000000000003 R09: 0000000000000000 R10: 0000000000008012 R11: 0000000000000246 R12: 00007f79978556d4 R13: 00000000004c70b4 R14: 00000000004dca98 R15: 00000000ffffffff kobject: 'ipŽi0' (ffff888097748df0): kobject_cleanup, parent (null) kobject: 'ipŽi0' (ffff888097748df0): calling ktype release kobject: 'loop4' (ffff888068216d60): kobject_uevent_env kobject: 'ipŽi0': free name kobject: 'loop4' (ffff888068216d60): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'ipŽi0' (ffff888096de8e70): kobject_add_internal: parent: 'net', set: 'devices' kobject: 'ipŽi0' (ffff888096de8e70): kobject_uevent_env kobject: 'ipŽi0' (ffff888096de8e70): fill_kobj_path: path = '/devices/virtual/net/ipŽi0' kobject: 'queues' (ffff8880a94d8648): kobject_add_internal: parent: 'ipŽi0', set: '' kobject: 'queues' (ffff8880a94d8648): kobject_uevent_env kobject: 'queues' (ffff8880a94d8648): kobject_uevent_env: filter function caused the event to drop! kobject: 'rx-0' (ffff88808f3a4c10): kobject_add_internal: parent: 'queues', set: 'queues' kobject: 'rx-0' (ffff88808f3a4c10): kobject_uevent_env kobject: 'rx-0' (ffff88808f3a4c10): fill_kobj_path: path = '/devices/virtual/net/ipŽi0/queues/rx-0' kobject: 'tx-0' (ffff888080ea7a58): kobject_add_internal: parent: 'queues', set: 'queues' kobject: 'tx-0' (ffff888080ea7a58): kobject_uevent_env kobject: 'tx-0' (ffff888080ea7a58): fill_kobj_path: path = '/devices/virtual/net/ipŽi0/queues/tx-0' kobject: 'rx-0' (ffff88808f3a4c10): kobject_cleanup, parent ffff8880a94d8648 kobject: 'rx-0' (ffff88808f3a4c10): auto cleanup 'remove' event kobject: 'rx-0' (ffff88808f3a4c10): kobject_uevent_env kobject: 'rx-0' (ffff88808f3a4c10): fill_kobj_path: path = '/devices/virtual/net/ipŽi0/queues/rx-0' kobject: 'rx-0' (ffff88808f3a4c10): auto cleanup kobject_del kobject: 'rx-0' (ffff88808f3a4c10): calling ktype release kobject: 'rx-0': free name kobject: 'loop4' (ffff888068216d60): kobject_uevent_env kobject: 'tx-0' (ffff888080ea7a58): kobject_cleanup, parent ffff8880a94d8648 kobject: 'loop4' (ffff888068216d60): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'tx-0' (ffff888080ea7a58): auto cleanup 'remove' event kobject: 'tx-0' (ffff888080ea7a58): kobject_uevent_env kobject: 'tx-0' (ffff888080ea7a58): fill_kobj_path: path = '/devices/virtual/net/ipŽi0/queues/tx-0' kobject: 'tx-0' (ffff888080ea7a58): auto cleanup kobject_del kobject: 'tx-0' (ffff888080ea7a58): calling ktype release kobject: 'tx-0': free name kobject: 'queues' (ffff8880a94d8648): kobject_cleanup, parent (null) kobject: 'queues' (ffff8880a94d8648): calling ktype release kobject: 'queues' (ffff8880a94d8648): kset_release kobject: 'queues': free name kobject: 'ipŽi0' (ffff888096de8e70): kobject_uevent_env kobject: 'ipŽi0' (ffff888096de8e70): fill_kobj_path: path = '/devices/virtual/net/ipŽi0' kobject: 'ipŽi0' (ffff888096de8e70): kobject_cleanup, parent (null) kobject: 'ipŽi0' (ffff888096de8e70): calling ktype release kobject: 'ipŽi0': free name net_ratelimit: 22 callbacks suppressed protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 protocol 88fb is buggy, dev hsr_slave_1 kobject: 'bonding_slave' (ffff88808b478a98): kobject_add_internal: parent: 'bond_slave_1', set: '' bond0: Enslaving bond_slave_1 as an active interface with an up link kobject: 'ipŽi0' (ffff8880392b0eb0): kobject_add_internal: parent: 'net', set: 'devices' kobject: 'ipŽi0' (ffff8880392b0eb0): kobject_uevent_env kobject: 'ipŽi0' (ffff8880392b0eb0): fill_kobj_path: path = '/devices/virtual/net/ipŽi0' kobject: 'queues' (ffff8880911d2b48): kobject_add_internal: parent: 'ipŽi0', set: '' kobject: 'queues' (ffff8880911d2b48): kobject_uevent_env kobject: 'queues' (ffff8880911d2b48): kobject_uevent_env: filter function caused the event to drop! kobject: 'rx-0' (ffff8880a8b3ab50): kobject_add_internal: parent: 'queues', set: 'queues' kobject: 'rx-0' (ffff8880a8b3ab50): kobject_uevent_env kobject: 'rx-0' (ffff8880a8b3ab50): fill_kobj_path: path = '/devices/virtual/net/ipŽi0/queues/rx-0' kobject: 'tx-0' (ffff88804682c358): kobject_add_internal: parent: 'queues', set: 'queues' kobject: 'tx-0' (ffff88804682c358): kobject_uevent_env kobject: 'tx-0' (ffff88804682c358): fill_kobj_path: path = '/devices/virtual/net/ipŽi0/queues/tx-0' bond0: Error: Device is in use and cannot be enslaved kobject: 'rx-0' (ffff8880a8b3ab50): kobject_cleanup, parent ffff8880911d2b48 kobject: 'loop4' (ffff888068216d60): kobject_uevent_env kobject: 'loop4' (ffff888068216d60): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'rx-0' (ffff8880a8b3ab50): auto cleanup 'remove' event kobject: 'rx-0' (ffff8880a8b3ab50): kobject_uevent_env kobject: 'rx-0' (ffff8880a8b3ab50): fill_kobj_path: path = '/devices/virtual/net/ipŽi0/queues/rx-0' kobject: 'rx-0' (ffff8880a8b3ab50): auto cleanup kobject_del kobject: 'rx-0' (ffff8880a8b3ab50): calling ktype release kobject: 'rx-0': free name kobject: 'tx-0' (ffff88804682c358): kobject_cleanup, parent ffff8880911d2b48 kobject: 'tx-0' (ffff88804682c358): auto cleanup 'remove' event kobject: 'tx-0' (ffff88804682c358): kobject_uevent_env kobject: 'tx-0' (ffff88804682c358): fill_kobj_path: path = '/devices/virtual/net/ipŽi0/queues/tx-0' kobject: 'tx-0' (ffff88804682c358): auto cleanup kobject_del kobject: 'tx-0' (ffff88804682c358): calling ktype release kobject: 'tx-0': free name kobject: 'queues' (ffff8880911d2b48): kobject_cleanup, parent (null) kobject: 'queues' (ffff8880911d2b48): calling ktype release kobject: 'queues' (ffff8880911d2b48): kset_release kobject: 'queues': free name kobject: 'ipŽi0' (ffff8880392b0eb0): kobject_uevent_env kobject: 'ipŽi0' (ffff8880392b0eb0): fill_kobj_path: path = '/devices/virtual/net/ipŽi0' kobject: 'ipŽi0' (ffff8880392b0eb0): kobject_cleanup, parent (null) kobject: 'ipŽi0' (ffff8880392b0eb0): calling ktype release kobject: 'ipŽi0': free name protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 NOHZ: local_softirq_pending 08 kobject: 'bonding_slave' (ffff88808b478a98): kobject_cleanup, parent ffff8880830debf0 kobject: 'bonding_slave' (ffff88808b478a98): does not have a release() function, it is broken and must be fixed. kobject: 'bonding_slave' (ffff88808b478a98): auto cleanup kobject_del kobject: 'bonding_slave': free name bond0: Releasing backup interface bond_slave_1 kobject: 'bonding_slave' (ffff888061650f18): kobject_cleanup, parent ffff888014c0b430 kobject: 'bonding_slave' (ffff888061650f18): does not have a release() function, it is broken and must be fixed. kobject: 'bonding_slave' (ffff888061650f18): auto cleanup kobject_del kobject: 'bonding_slave': free name bond0: Releasing backup interface bond_slave_1 kobject: 'bonding_slave' (ffff88808fd74a98): kobject_cleanup, parent ffff888083365470 kobject: 'bonding_slave' (ffff88808fd74a98): does not have a release() function, it is broken and must be fixed. kobject: 'bonding_slave' (ffff88808fd74a98): auto cleanup kobject_del kobject: 'bonding_slave': free name bond0: Releasing backup interface bond_slave_1 kobject: 'bonding_slave' (ffff888063149c98): kobject_add_internal: parent: 'bond_slave_1', set: '' bond0: Enslaving bond_slave_1 as an active interface with an up link kobject: 'loop4' (ffff888068216d60): kobject_uevent_env kobject: 'loop4' (ffff888068216d60): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'bonding_slave' (ffff8880a5834f18): kobject_add_internal: parent: 'bond_slave_1', set: '' bond0: Enslaving bond_slave_1 as an active interface with an up link kobject: 'bonding_slave' (ffff888066bbb398): kobject_add_internal: parent: 'bond_slave_1', set: '' bond0: Enslaving bond_slave_1 as an active interface with an up link kobject: 'loop4' (ffff888068216d60): kobject_uevent_env kobject: 'loop4' (ffff888068216d60): fill_kobj_path: path = '/devices/virtual/block/loop4' net_ratelimit: 16 callbacks suppressed protocol 88fb is buggy, dev hsr_slave_0 kobject: 'bonding_slave' (ffff888063149c98): kobject_cleanup, parent ffff888014c0b430 protocol 88fb is buggy, dev hsr_slave_1 kobject: 'bonding_slave' (ffff888063149c98): does not have a release() function, it is broken and must be fixed. kobject: 'bonding_slave' (ffff888063149c98): auto cleanup kobject_del kobject: 'bonding_slave': free name bond0: Releasing backup interface bond_slave_1 kobject: 'bonding_slave' (ffff888066bbb398): kobject_cleanup, parent ffff888083365470 kobject: 'bonding_slave' (ffff888066bbb398): does not have a release() function, it is broken and must be fixed. kobject: 'bonding_slave' (ffff888066bbb398): auto cleanup kobject_del kobject: 'bonding_slave': free name bond0: Releasing backup interface bond_slave_1 protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 protocol 88fb is buggy, dev hsr_slave_1 kobject: 'bonding_slave' (ffff8880a5834f18): kobject_cleanup, parent ffff8880830debf0 kobject: 'bonding_slave' (ffff8880a5834f18): does not have a release() function, it is broken and must be fixed. kobject: 'bonding_slave' (ffff8880a5834f18): auto cleanup kobject_del kobject: 'loop4' (ffff888068216d60): kobject_uevent_env kobject: 'bonding_slave': free name kobject: 'loop4' (ffff888068216d60): fill_kobj_path: path = '/devices/virtual/block/loop4' bond0: Releasing backup interface bond_slave_1 kobject: 'loop4' (ffff888068216d60): kobject_uevent_env kobject: 'loop4' (ffff888068216d60): fill_kobj_path: path = '/devices/virtual/block/loop4' protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 kobject: 'bonding_slave' (ffff88803ab48f58): kobject_add_internal: parent: 'bond_slave_1', set: '' bond0: Enslaving bond_slave_1 as an active interface with an up link protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 kobject: 'loop4' (ffff888068216d60): kobject_uevent_env kobject: 'loop4' (ffff888068216d60): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop4' (ffff888068216d60): kobject_uevent_env kobject: 'loop4' (ffff888068216d60): fill_kobj_path: path = '/devices/virtual/block/loop4' protocol 88fb is buggy, dev hsr_slave_0 kobject: 'bonding_slave' (ffff88803ab48f58): kobject_cleanup, parent ffff8880830debf0 kobject: 'bonding_slave' (ffff88803ab48f58): does not have a release() function, it is broken and must be fixed. kobject: 'bonding_slave' (ffff88803ab48f58): auto cleanup kobject_del kobject: 'bonding_slave': free name bond0: Releasing backup interface bond_slave_1 audit: type=1400 audit(2000000233.892:532): avc: denied { associate } for pid=11062 comm="syz-executor.5" name="#28" scontext=system_u:object_r:unlabeled_t:s0 tcontext=system_u:object_r:tmpfs_t:s0 tclass=filesystem permissive=1 kobject: 'loop4' (ffff888068216d60): kobject_uevent_env kobject: 'loop4' (ffff888068216d60): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop4' (ffff888068216d60): kobject_uevent_env kobject: 'loop4' (ffff888068216d60): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop4' (ffff888068216d60): kobject_uevent_env kobject: 'loop4' (ffff888068216d60): fill_kobj_path: path = '/devices/virtual/block/loop4'