====================================================== [ INFO: possible circular locking dependency detected ] 4.4.120-gd63fdf6 #29 Not tainted ------------------------------------------------------- syz-executor4/8223 is trying to acquire lock: (&sb->s_type->i_mutex_key#10){+.+.+.}, at: [] shmem_file_llseek+0xf1/0x240 mm/shmem.c:1816 but task is already holding lock: (ashmem_mutex){+.+.+.}, at: [] ashmem_llseek+0x56/0x1f0 drivers/staging/android/ashmem.c:330 which lock already depends on the new lock. PF_BRIDGE: RTM_SETLINK with unknown ifindex PF_BRIDGE: RTM_SETLINK with unknown ifindex the existing dependency chain (in reverse order) is: [] lock_acquire+0x15e/0x460 kernel/locking/lockdep.c:3592 ALSA: seq fatal error: cannot create timer (-22) [] __mutex_lock_common kernel/locking/mutex.c:521 [inline] [] mutex_lock_nested+0xbb/0x850 kernel/locking/mutex.c:621 [] ashmem_mmap+0x53/0x400 drivers/staging/android/ashmem.c:366 ALSA: seq fatal error: cannot create timer (-22) [] mmap_region+0x94f/0x1250 mm/mmap.c:1664 [] do_mmap+0x4fd/0x9d0 mm/mmap.c:1441 [] do_mmap_pgoff include/linux/mm.h:1915 [inline] [] vm_mmap_pgoff+0x16e/0x1c0 mm/util.c:296 [] SYSC_mmap_pgoff mm/mmap.c:1491 [inline] [] SyS_mmap_pgoff+0x33f/0x560 mm/mmap.c:1449 [] do_syscall_32_irqs_on arch/x86/entry/common.c:392 [inline] [] do_fast_syscall_32+0x321/0x8a0 arch/x86/entry/common.c:459 [] sysenter_flags_fixed+0xd/0x17 [] lock_acquire+0x15e/0x460 kernel/locking/lockdep.c:3592 [] __might_fault+0x14a/0x1d0 mm/memory.c:3810 [] copy_to_user arch/x86/include/asm/uaccess.h:760 [inline] [] filldir+0x162/0x2d0 fs/readdir.c:180 [] dir_emit_dot include/linux/fs.h:3070 [inline] [] dir_emit_dots include/linux/fs.h:3081 [inline] [] dcache_readdir+0x11e/0x7b0 fs/libfs.c:150 [] iterate_dir+0x1c8/0x420 fs/readdir.c:42 [] SYSC_getdents fs/readdir.c:215 [inline] [] SyS_getdents+0x14a/0x270 fs/readdir.c:196 [] entry_SYSCALL_64_fastpath+0x1c/0x98 [] check_prev_add kernel/locking/lockdep.c:1853 [inline] [] check_prevs_add kernel/locking/lockdep.c:1958 [inline] [] validate_chain kernel/locking/lockdep.c:2144 [inline] [] __lock_acquire+0x371f/0x4b50 kernel/locking/lockdep.c:3213 [] lock_acquire+0x15e/0x460 kernel/locking/lockdep.c:3592 [] __mutex_lock_common kernel/locking/mutex.c:521 [inline] [] mutex_lock_nested+0xbb/0x850 kernel/locking/mutex.c:621 [] shmem_file_llseek+0xf1/0x240 mm/shmem.c:1816 [] vfs_llseek+0xa2/0xd0 fs/read_write.c:260 [] ashmem_llseek+0xe7/0x1f0 drivers/staging/android/ashmem.c:342 [] vfs_llseek fs/read_write.c:260 [inline] [] SYSC_lseek fs/read_write.c:285 [inline] [] SyS_lseek fs/read_write.c:276 [inline] [] C_SYSC_lseek fs/read_write.c:297 [inline] [] compat_SyS_lseek+0xeb/0x170 fs/read_write.c:295 [] do_syscall_32_irqs_on arch/x86/entry/common.c:392 [inline] [] do_fast_syscall_32+0x321/0x8a0 arch/x86/entry/common.c:459 [] sysenter_flags_fixed+0xd/0x17 other info that might help us debug this: Chain exists of: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(ashmem_mutex); lock(&mm->mmap_sem); lock(ashmem_mutex); lock(&sb->s_type->i_mutex_key#10); *** DEADLOCK *** 1 lock held by syz-executor4/8223: #0: (ashmem_mutex){+.+.+.}, at: [] ashmem_llseek+0x56/0x1f0 drivers/staging/android/ashmem.c:330 stack backtrace: CPU: 1 PID: 8223 Comm: syz-executor4 Not tainted 4.4.120-gd63fdf6 #29 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 0000000000000000 4cb4f91a800765d6 ffff8800ac497a58 ffffffff81d0408d ffffffff8519fcb0 ffffffff851a99a0 ffffffff851beb20 ffff8801c6d220f8 ffff8801c6d21800 ffff8800ac497aa0 ffffffff81233ba1 ffff8801c6d220f8 Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x124 lib/dump_stack.c:51 [] print_circular_bug+0x271/0x310 kernel/locking/lockdep.c:1226 [] check_prev_add kernel/locking/lockdep.c:1853 [inline] [] check_prevs_add kernel/locking/lockdep.c:1958 [inline] [] validate_chain kernel/locking/lockdep.c:2144 [inline] [] __lock_acquire+0x371f/0x4b50 kernel/locking/lockdep.c:3213 [] lock_acquire+0x15e/0x460 kernel/locking/lockdep.c:3592 [] __mutex_lock_common kernel/locking/mutex.c:521 [inline] [] mutex_lock_nested+0xbb/0x850 kernel/locking/mutex.c:621 [] shmem_file_llseek+0xf1/0x240 mm/shmem.c:1816 [] vfs_llseek+0xa2/0xd0 fs/read_write.c:260 [] ashmem_llseek+0xe7/0x1f0 drivers/staging/android/ashmem.c:342 [] vfs_llseek fs/read_write.c:260 [inline] [] SYSC_lseek fs/read_write.c:285 [inline] [] SyS_lseek fs/read_write.c:276 [inline] [] C_SYSC_lseek fs/read_write.c:297 [inline] [] compat_SyS_lseek+0xeb/0x170 fs/read_write.c:295 [] do_syscall_32_irqs_on arch/x86/entry/common.c:392 [inline] [] do_fast_syscall_32+0x321/0x8a0 arch/x86/entry/common.c:459 [] sysenter_flags_fixed+0xd/0x17 audit_printk_skb: 10 callbacks suppressed audit: type=1400 audit(1521468403.740:32): avc: denied { create } for pid=8260 comm="syz-executor7" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_rdma_socket permissive=1 ALSA: seq fatal error: cannot create timer (-22) ALSA: seq fatal error: cannot create timer (-22) audit: type=1401 audit(1521468403.990:33): op=fscreate invalid_context=73797374656D5F753A6F626A6563745F723A6E65746C6162656C5F6D676D745F657865635F743A733000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000[ 56.930009] binder: 8313:8316 ioctl c0306201 20004000 returned -14 binder: BINDER_SET_CONTEXT_MGR already set binder: 8313:8325 ioctl 40046207 0 returned -16 binder_alloc: 8313: binder_alloc_buf, no vma binder: 8313:8325 transaction failed 29189/-3, size 0-0 line 3128 binder: undelivered TRANSACTION_ERROR: 29189 binder: undelivered TRANSACTION_COMPLETE binder: undelivered transaction 23, process died. audit: type=1401 audit(1521468404.130:34): op=fscreate invalid_context=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[ 57.203578] binder: undelivered TRANSACTION_COMPLETE binder: undelivered transaction 27, process died. binder: 8565:8567 BC_INCREFS_DONE u0000000000000000 no match binder: 8565:8567 got reply transaction with no transaction stack binder: 8565:8579 BC_DEAD_BINDER_DONE 0000000000000000 not found binder: 8565:8567 transaction failed 29201/-71, size 0-0 line 2921 binder_alloc: binder_alloc_mmap_handler: 8560 20ffd000-20ffe000 already mapped failed -16 binder_alloc: binder_alloc_mmap_handler: 8560 20ffd000-20ffe000 already mapped failed -16 binder: 8565:8567 BC_INCREFS_DONE u0000000000000000 no match binder: 8565:8579 BC_DEAD_BINDER_DONE 0000000000000000 not found binder: 8565:8567 got reply transaction with no transaction stack binder: 8565:8567 transaction failed 29201/-71, size 0-0 line 2921 binder: undelivered TRANSACTION_ERROR: 29201 binder: undelivered TRANSACTION_ERROR: 29201 sd 0:0:1:0: [sg0] tag#140 FAILED Result: hostbyte=DID_ABORT driverbyte=DRIVER_OK sd 0:0:1:0: [sg0] tag#140 CDB: Test Unit Ready sd 0:0:1:0: [sg0] tag#140 CDB[00]: 00 05 00 20 4a 00 00 00 00 00 00 00 00 00 00 00 sd 0:0:1:0: [sg0] tag#140 CDB[10]: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 sd 0:0:1:0: [sg0] tag#140 CDB[20]: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 sd 0:0:1:0: [sg0] tag#140 CDB[30]: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 sd 0:0:1:0: [sg0] tag#140 CDB[40]: 2e 2f 66 69 6c 65 30 00 00 00 00 00 00 00 00 00 sd 0:0:1:0: [sg0] tag#140 CDB[50]: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 sd 0:0:1:0: [sg0] tag#140 CDB[60]: 00 00 00 00 00 sd 0:0:1:0: [sg0] tag#48 FAILED Result: hostbyte=DID_ABORT driverbyte=DRIVER_OK sd 0:0:1:0: [sg0] tag#48 CDB: Test Unit Ready sd 0:0:1:0: [sg0] tag#48 CDB[00]: 00 05 00 20 4a 00 00 00 00 00 00 00 00 00 00 00 sd 0:0:1:0: [sg0] tag#48 CDB[10]: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 sd 0:0:1:0: [sg0] tag#48 CDB[20]: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 sd 0:0:1:0: [sg0] tag#48 CDB[30]: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 sd 0:0:1:0: [sg0] tag#48 CDB[40]: 2e 2f 66 69 6c 65 30 00 00 00 00 00 00 00 00 00 sd 0:0:1:0: [sg0] tag#48 CDB[50]: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 sd 0:0:1:0: [sg0] tag#48 CDB[60]: 00 00 00 00 00 sd 0:0:1:0: [sg0] tag#48 FAILED Result: hostbyte=DID_ABORT driverbyte=DRIVER_OK sd 0:0:1:0: [sg0] tag#48 CDB: Test Unit Ready sd 0:0:1:0: [sg0] tag#48 CDB[00]: 00 05 00 20 4a 00 00 00 00 00 00 00 00 00 00 00 sd 0:0:1:0: [sg0] tag#48 CDB[10]: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 sd 0:0:1:0: [sg0] tag#48 CDB[20]: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 sd 0:0:1:0: [sg0] tag#48 CDB[30]: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 sd 0:0:1:0: [sg0] tag#48 CDB[40]: 2e 2f 66 69 6c 65 30 00 00 00 00 00 00 00 00 00 sd 0:0:1:0: [sg0] tag#48 CDB[50]: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 sd 0:0:1:0: [sg0] tag#48 CDB[60]: 00 00 00 00 00 binder: 8905 RLIMIT_NICE not set binder: BINDER_SET_CONTEXT_MGR already set binder: 8884:8905 ioctl 40046207 0 returned -16 binder_alloc: 8884: binder_alloc_buf, no vma binder: 8884:8919 transaction failed 29189/-3, size 0-0 line 3128 binder: undelivered TRANSACTION_COMPLETE binder: undelivered transaction 32, process died. binder: undelivered TRANSACTION_COMPLETE audit: type=1400 audit(1521468406.830:35): avc: denied { create } for pid=8971 comm="syz-executor1" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_iscsi_socket permissive=1 skbuff: bad partial csum: csum=65535/65535 len=20 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket audit: type=1400 audit(1521468407.900:36): avc: denied { create } for pid=9218 comm="syz-executor0" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_scsitransport_socket permissive=1 SELinux: unrecognized netlink message: protocol=4 nlmsg_type=22 sclass=netlink_tcpdiag_socket SELinux: unrecognized netlink message: protocol=4 nlmsg_type=22 sclass=netlink_tcpdiag_socket TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket SELinux: unrecognized netlink message: protocol=0 nlmsg_type=65 sclass=netlink_route_socket audit: type=1400 audit(1521468409.880:37): avc: denied { execute } for pid=9857 comm="syz-executor2" path="/proc/701/oom_score_adj" dev="proc" ino=22845 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=file permissive=1 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=128 sclass=netlink_route_socket SELinux: unrecognized netlink message: protocol=0 nlmsg_type=48839 sclass=netlink_route_socket SELinux: unrecognized netlink message: protocol=0 nlmsg_type=48839 sclass=netlink_route_socket binder: release 9930:9937 transaction 35 in, still active binder: send failed reply for transaction 35 to 9930:9945 binder: 9930:9937 unknown command 0 binder: BINDER_SET_CONTEXT_MGR already set binder: 9930:9945 ioctl 40046207 0 returned -16 binder: 9930:9937 ioctl c0306201 20004000 returned -22 binder_alloc: binder_alloc_mmap_handler: 9930 2000c000-2000e000 already mapped failed -16 binder_alloc: 9930: binder_alloc_buf, no vma binder: 9930:9945 transaction failed 29189/-3, size 0-0 line 3128 binder: undelivered TRANSACTION_ERROR: 29189 binder: release 9952:9961 transaction 38 in, still active binder: send failed reply for transaction 38 to 9952:9972 binder: undelivered TRANSACTION_COMPLETE binder: undelivered TRANSACTION_ERROR: 29189 binder: release 9991:9994 transaction 40 in, still active binder: send failed reply for transaction 40 to 9991:10011 binder: undelivered TRANSACTION_COMPLETE binder: undelivered TRANSACTION_ERROR: 29189 binder: release 10037:10052 transaction 42 in, still active binder: send failed reply for transaction 42 to 10037:10062 binder: undelivered TRANSACTION_COMPLETE binder: undelivered TRANSACTION_ERROR: 29189 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=64675 sclass=netlink_route_socket binder: release 10079:10086 transaction 44 in, still active binder: send failed reply for transaction 44 to 10079:10095 binder: undelivered TRANSACTION_COMPLETE binder: undelivered TRANSACTION_ERROR: 29189 binder: release 10121:10124 transaction 46 in, still active binder: send failed reply for transaction 46 to 10121:10140 binder: undelivered TRANSACTION_COMPLETE binder: undelivered TRANSACTION_ERROR: 29189 binder: release 10154:10157 transaction 48 in, still active binder: send failed reply for transaction 48 to 10154:10165 binder: undelivered TRANSACTION_COMPLETE binder: undelivered TRANSACTION_ERROR: 29189 binder: release 10175:10178 transaction 50 in, still active binder: send failed reply for transaction 50 to 10175:10188 binder: undelivered TRANSACTION_COMPLETE binder: undelivered TRANSACTION_ERROR: 29189 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=11264 sclass=netlink_route_socket binder: release 10197:10206 transaction 52 in, still active binder: send failed reply for transaction 52 to 10197:10214 binder: undelivered TRANSACTION_COMPLETE binder: undelivered TRANSACTION_ERROR: 29189 binder: 10221:10234 BC_FREE_BUFFER u000000002000c000 no match binder: 10260:10278 BC_FREE_BUFFER u000000002000c000 no match binder: 10293:10309 BC_FREE_BUFFER u000000002000c000 no match binder_alloc: 10321: binder_alloc_buf, no vma binder: 10321:10340 transaction failed 29189/-3, size 0-0 line 3128 binder: 10321:10344 BC_FREE_BUFFER u0000000000000000 no match binder: undelivered TRANSACTION_ERROR: 29189 binder_alloc: 10370: binder_alloc_buf, no vma binder: 10370:10376 transaction failed 29189/-3, size 0-0 line 3128 binder: undelivered TRANSACTION_ERROR: 29189 binder: 10370:10376 BC_FREE_BUFFER u0000000000000000 no match binder_alloc: 10382: binder_alloc_buf, no vma binder: BINDER_SET_CONTEXT_MGR already set binder: 10393:10402 ioctl 40046207 0 returned -16 binder: 10382:10400 transaction failed 29189/-3, size 0-0 line 3128 binder_alloc: 10382: binder_alloc_buf, no vma binder: 10393:10408 transaction failed 29189/-3, size 0-0 line 3128 binder: undelivered TRANSACTION_ERROR: 29189 binder: 10393:10408 BC_FREE_BUFFER u0000000000000000 no match binder: undelivered TRANSACTION_ERROR: 29189 binder: release 10413:10417 transaction 64 out, still active binder: undelivered TRANSACTION_COMPLETE binder: 10413:10435 BC_FREE_BUFFER u000000002000c000 matched unreturned buffer audit: type=1400 audit(1521468412.230:38): avc: denied { create } for pid=10438 comm="syz-executor0" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_fib_lookup_socket permissive=1 binder: send failed reply for transaction 64, target dead binder: release 10460:10462 transaction 66 out, still active binder: undelivered TRANSACTION_COMPLETE binder: 10460:10462 BC_FREE_BUFFER u000000002000c000 matched unreturned buffer binder: send failed reply for transaction 66, target dead binder: release 10479:10487 transaction 68 out, still active binder: undelivered TRANSACTION_COMPLETE binder: 10479:10487 BC_FREE_BUFFER u000000002000c000 matched unreturned buffer binder: send failed reply for transaction 68, target dead audit: type=1400 audit(1521468412.480:39): avc: denied { write } for pid=10524 comm="syz-executor0" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_fib_lookup_socket permissive=1 binder: 10509:10544 transaction failed 29189/-22, size 0-0 line 3005 binder: undelivered TRANSACTION_ERROR: 29189 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket binder: 10569:10586 transaction failed 29189/-22, size 0-0 line 3005 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket binder: undelivered TRANSACTION_ERROR: 29189 binder: 10569:10586 BC_FREE_BUFFER u000000002000c000 no match binder: 10598:10619 transaction failed 29189/-22, size 0-0 line 3005 binder: undelivered TRANSACTION_ERROR: 29189 binder: 10598:10619 BC_FREE_BUFFER u000000002000c000 no match binder: release 10654:10667 transaction 73 out, still active binder: undelivered TRANSACTION_COMPLETE binder: 10654:10684 BC_FREE_BUFFER u000000002000c000 matched unreturned buffer ================================================================== BUG: KASAN: slab-out-of-bounds in list_empty include/linux/list.h:189 [inline] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0xf9/0x110 drivers/scsi/sg.c:2120 Read of size 8 at addr ffff8800b41d9940 by task syz-executor3/10697 CPU: 0 PID: 10697 Comm: syz-executor3 Not tainted 4.4.120-gd63fdf6 #29 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011