netlink: 1 bytes leftover after parsing attributes in process `syz-executor4'. ====================================================== WARNING: possible circular locking dependency detected 4.14.0+ #190 Not tainted ------------------------------------------------------ syz-executor3/14595 is trying to acquire lock: (&pipe->mutex/1){+.+.}, at: [] pipe_lock_nested fs/pipe.c:67 [inline] (&pipe->mutex/1){+.+.}, at: [] pipe_lock+0x56/0x70 fs/pipe.c:75 but task is already holding lock: (sb_writers){.+.+}, at: [] file_start_write include/linux/fs.h:2715 [inline] (sb_writers){.+.+}, at: [] do_splice fs/splice.c:1146 [inline] (sb_writers){.+.+}, at: [] SYSC_splice fs/splice.c:1402 [inline] (sb_writers){.+.+}, at: [] SyS_splice+0x1117/0x1630 fs/splice.c:1382 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #5 (sb_writers){.+.+}: complete+0x18/0x80 kernel/sched/completion.c:35 -> #4 ((completion)&req.done){+.+.}: lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:4004 complete_acquire include/linux/completion.h:40 [inline] __wait_for_common kernel/sched/completion.c:109 [inline] wait_for_common kernel/sched/completion.c:123 [inline] wait_for_completion+0xcb/0x7b0 kernel/sched/completion.c:144 devtmpfs_create_node+0x32b/0x4a0 drivers/base/devtmpfs.c:115 device_add+0x120f/0x1640 drivers/base/core.c:1824 device_register+0x1d/0x20 drivers/base/core.c:1905 tty_register_device_attr+0x422/0x740 drivers/tty/tty_io.c:2956 tty_port_register_device_attr_serdev+0x100/0x140 drivers/tty/tty_port.c:166 uart_add_one_port+0xa7a/0x15b0 drivers/tty/serial/serial_core.c:2783 serial8250_register_8250_port+0xfac/0x1990 drivers/tty/serial/8250/8250_core.c:1045 serial_pnp_probe+0x5e7/0xac0 drivers/tty/serial/8250/8250_pnp.c:480 pnp_device_probe+0x15f/0x250 drivers/pnp/driver.c:109 really_probe drivers/base/dd.c:424 [inline] driver_probe_device+0x71b/0xae0 drivers/base/dd.c:566 __driver_attach+0x181/0x1c0 drivers/base/dd.c:800 bus_for_each_dev+0x154/0x1e0 drivers/base/bus.c:313 driver_attach+0x3d/0x50 drivers/base/dd.c:819 bus_add_driver+0x466/0x620 drivers/base/bus.c:669 driver_register+0x1bf/0x3c0 drivers/base/driver.c:168 pnp_register_driver+0x75/0xa0 drivers/pnp/driver.c:272 serial8250_pnp_init+0x15/0x20 drivers/tty/serial/8250/8250_pnp.c:537 serial8250_init+0x8f/0x270 drivers/tty/serial/8250/8250_core.c:1122 do_one_initcall+0x9e/0x330 init/main.c:826 do_initcall_level init/main.c:892 [inline] do_initcalls init/main.c:900 [inline] do_basic_setup init/main.c:918 [inline] kernel_init_freeable+0x469/0x521 init/main.c:1066 kernel_init+0x13/0x172 init/main.c:993 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:437 -> #3 (&port->mutex){+.+.}: lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:4004 __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0x16f/0x1a80 kernel/locking/mutex.c:893 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908 uart_set_termios+0x8f/0x5b0 drivers/tty/serial/serial_core.c:1416 tty_set_termios+0x6d4/0xa40 drivers/tty/tty_ioctl.c:334 set_termios+0x377/0x6b0 drivers/tty/tty_ioctl.c:414 tty_mode_ioctl+0x9fb/0xb10 drivers/tty/tty_ioctl.c:749 n_tty_ioctl_helper+0x40/0x360 drivers/tty/tty_ioctl.c:940 n_tty_ioctl+0x148/0x2d0 drivers/tty/n_tty.c:2435 tty_ioctl+0x32e/0x15f0 drivers/tty/tty_io.c:2638 vfs_ioctl fs/ioctl.c:46 [inline] do_vfs_ioctl+0x1b1/0x1530 fs/ioctl.c:686 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692 entry_SYSCALL_64_fastpath+0x1f/0x96 -> #2 (&tty->termios_rwsem){++++}: lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:4004 down_read+0x96/0x150 kernel/locking/rwsem.c:24 n_tty_write+0x249/0xed0 drivers/tty/n_tty.c:2285 do_tty_write drivers/tty/tty_io.c:949 [inline] tty_write+0x400/0x850 drivers/tty/tty_io.c:1033 redirected_tty_write+0xa1/0xb0 drivers/tty/tty_io.c:1054 __vfs_write+0xef/0x970 fs/read_write.c:480 vfs_write+0x18f/0x510 fs/read_write.c:544 SYSC_write fs/read_write.c:589 [inline] SyS_write+0xef/0x220 fs/read_write.c:581 entry_SYSCALL_64_fastpath+0x1f/0x96 -> #1 (&tty->ldisc_sem){++++}: lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:4004 __ldsem_down_read_nested+0xd1/0xa90 drivers/tty/tty_ldsem.c:325 ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 tty_ldisc_ref_wait+0x25/0x80 drivers/tty/tty_ldisc.c:277 tty_read+0xf8/0x250 drivers/tty/tty_io.c:852 do_loop_readv_writev fs/read_write.c:673 [inline] do_iter_read+0x3db/0x5b0 fs/read_write.c:897 vfs_readv+0x121/0x1c0 fs/read_write.c:959 kernel_readv fs/splice.c:361 [inline] default_file_splice_read+0x508/0xae0 fs/splice.c:416 do_splice_to+0x110/0x170 fs/splice.c:880 do_splice fs/splice.c:1173 [inline] SYSC_splice fs/splice.c:1402 [inline] SyS_splice+0x11a8/0x1630 fs/splice.c:1382 entry_SYSCALL_64_fastpath+0x1f/0x96 -> #0 (&pipe->mutex/1){+.+.}: check_prevs_add kernel/locking/lockdep.c:2031 [inline] validate_chain kernel/locking/lockdep.c:2473 [inline] __lock_acquire+0x3498/0x47f0 kernel/locking/lockdep.c:3500 lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:4004 __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0x16f/0x1a80 kernel/locking/mutex.c:893 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908 pipe_lock_nested fs/pipe.c:67 [inline] pipe_lock+0x56/0x70 fs/pipe.c:75 iter_file_splice_write+0x264/0xf30 fs/splice.c:699 do_splice_from fs/splice.c:851 [inline] do_splice fs/splice.c:1147 [inline] SYSC_splice fs/splice.c:1402 [inline] SyS_splice+0x7d5/0x1630 fs/splice.c:1382 entry_SYSCALL_64_fastpath+0x1f/0x96 other info that might help us debug this: Chain exists of: &pipe->mutex/1 --> (completion)&req.done --> sb_writers Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(sb_writers); lock((completion)&req.done); lock(sb_writers); lock(&pipe->mutex/1); *** DEADLOCK *** 1 lock held by syz-executor3/14595: #0: (sb_writers){.+.+}, at: [] file_start_write include/linux/fs.h:2715 [inline] #0: (sb_writers){.+.+}, at: [] do_splice fs/splice.c:1146 [inline] #0: (sb_writers){.+.+}, at: [] SYSC_splice fs/splice.c:1402 [inline] #0: (sb_writers){.+.+}, at: [] SyS_splice+0x1117/0x1630 fs/splice.c:1382 stack backtrace: CPU: 0 PID: 14595 Comm: syz-executor3 Not tainted 4.14.0+ #190 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+0x194/0x257 lib/dump_stack.c:53 print_circular_bug+0x42d/0x610 kernel/locking/lockdep.c:1271 check_prev_add+0x666/0x15f0 kernel/locking/lockdep.c:1914 check_prevs_add kernel/locking/lockdep.c:2031 [inline] validate_chain kernel/locking/lockdep.c:2473 [inline] __lock_acquire+0x3498/0x47f0 kernel/locking/lockdep.c:3500 lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:4004 __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0x16f/0x1a80 kernel/locking/mutex.c:893 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908 pipe_lock_nested fs/pipe.c:67 [inline] pipe_lock+0x56/0x70 fs/pipe.c:75 iter_file_splice_write+0x264/0xf30 fs/splice.c:699 do_splice_from fs/splice.c:851 [inline] do_splice fs/splice.c:1147 [inline] SYSC_splice fs/splice.c:1402 [inline] SyS_splice+0x7d5/0x1630 fs/splice.c:1382 entry_SYSCALL_64_fastpath+0x1f/0x96 RIP: 0033:0x452879 RSP: 002b:00007f3f1b117be8 EFLAGS: 00000212 ORIG_RAX: 0000000000000113 RAX: ffffffffffffffda RBX: 0000000000758020 RCX: 0000000000452879 RDX: 0000000000000019 RSI: 0000000000000000 RDI: 0000000000000017 RBP: 0000000000000086 R08: 00000000fffffdf8 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f4018 R13: 00000000ffffffff R14: 00007f3f1b1186d4 R15: 0000000000000000 netlink: 25 bytes leftover after parsing attributes in process `syz-executor0'. netlink: 25 bytes leftover after parsing attributes in process `syz-executor0'. SELinux: unrecognized netlink message: protocol=0 nlmsg_type=3 sclass=netlink_route_socket pig=14665 comm=syz-executor7 kauditd_printk_skb: 44 callbacks suppressed audit: type=1326 audit(1511359305.712:2668): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=14672 comm="syz-executor4" exe="/root/syz-executor4" sig=0 arch=c000003e syscall=202 compat=0 ip=0x452879 code=0x7ffc0000 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=14675 comm=syz-executor7 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=3 sclass=netlink_route_socket pig=14665 comm=syz-executor7 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=14665 comm=syz-executor7 audit: type=1326 audit(1511359305.712:2669): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=14672 comm="syz-executor4" exe="/root/syz-executor4" sig=0 arch=c000003e syscall=202 compat=0 ip=0x452879 code=0x7ffc0000 audit: type=1326 audit(1511359305.717:2670): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=14668 comm="syz-executor5" exe="/root/syz-executor5" sig=31 arch=c000003e syscall=202 compat=0 ip=0x452879 code=0xffff0000 audit: type=1326 audit(1511359305.722:2671): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=14672 comm="syz-executor4" exe="/root/syz-executor4" sig=0 arch=c000003e syscall=206 compat=0 ip=0x452879 code=0x7ffc0000 dccp_close: ABORT with 2 bytes unread audit: type=1326 audit(1511359305.723:2672): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=14672 comm="syz-executor4" exe="/root/syz-executor4" sig=0 arch=c000003e syscall=202 compat=0 ip=0x452879 code=0x7ffc0000 audit: type=1326 audit(1511359305.723:2673): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=14672 comm="syz-executor4" exe="/root/syz-executor4" sig=0 arch=c000003e syscall=202 compat=0 ip=0x452879 code=0x7ffc0000 audit: type=1326 audit(1511359305.723:2674): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=14672 comm="syz-executor4" exe="/root/syz-executor4" sig=0 arch=c000003e syscall=186 compat=0 ip=0x452879 code=0x7ffc0000 audit: type=1326 audit(1511359305.723:2675): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=14672 comm="syz-executor4" exe="/root/syz-executor4" sig=0 arch=c000003e syscall=202 compat=0 ip=0x452879 code=0x7ffc0000 audit: type=1326 audit(1511359305.723:2676): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=14672 comm="syz-executor4" exe="/root/syz-executor4" sig=0 arch=c000003e syscall=202 compat=0 ip=0x452879 code=0x7ffc0000 audit: type=1326 audit(1511359305.723:2677): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=14672 comm="syz-executor4" exe="/root/syz-executor4" sig=0 arch=c000003e syscall=85 compat=0 ip=0x452879 code=0x7ffc0000 netlink: 16 bytes leftover after parsing attributes in process `syz-executor7'. device gre0 entered promiscuous mode device lo entered promiscuous mode QAT: Invalid ioctl QAT: Invalid ioctl print_req_error: I/O error, dev loop0, sector 0 print_req_error: I/O error, dev loop0, sector 0 IPv6: NLM_F_REPLACE set, but no existing node found! IPv6: NLM_F_REPLACE set, but no existing node found! device gre0 entered promiscuous mode nla_parse: 7 callbacks suppressed netlink: 5 bytes leftover after parsing attributes in process `syz-executor6'. netlink: 5 bytes leftover after parsing attributes in process `syz-executor6'. netlink: 18 bytes leftover after parsing attributes in process `syz-executor6'. netlink: 1 bytes leftover after parsing attributes in process `syz-executor6'. netlink: 1 bytes leftover after parsing attributes in process `syz-executor6'. SELinux: unrecognized netlink message: protocol=4 nlmsg_type=38 sclass=netlink_tcpdiag_socket pig=15250 comm=syz-executor4 Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable SELinux: unrecognized netlink message: protocol=4 nlmsg_type=38 sclass=netlink_tcpdiag_socket pig=15250 comm=syz-executor4 netlink: 8 bytes leftover after parsing attributes in process `syz-executor7'. Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable netlink: 8 bytes leftover after parsing attributes in process `syz-executor7'. sg_write: data in/out 156/14 bytes for SCSI command 0x85-- guessing data in; program syz-executor7 not setting count and/or reply_len properly sg_write: data in/out 156/14 bytes for SCSI command 0x85-- guessing data in; program syz-executor7 not setting count and/or reply_len properly FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 1 PID: 15333 Comm: syz-executor3 Not tainted 4.14.0+ #190 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+0x194/0x257 lib/dump_stack.c:53 fail_dump lib/fault-inject.c:51 [inline] should_fail+0x8c0/0xa40 lib/fault-inject.c:149 should_failslab+0xec/0x120 mm/failslab.c:32 slab_pre_alloc_hook mm/slab.h:421 [inline] slab_alloc_node mm/slab.c:3292 [inline] kmem_cache_alloc_node_trace+0x5a/0x760 mm/slab.c:3654 kmalloc_node include/linux/slab.h:537 [inline] kzalloc_node include/linux/slab.h:699 [inline] __get_vm_area_node+0xae/0x340 mm/vmalloc.c:1402 __vmalloc_node_range+0xa3/0x650 mm/vmalloc.c:1754 __vmalloc_node mm/vmalloc.c:1804 [inline] __vmalloc+0x45/0x50 mm/vmalloc.c:1810 bpf_prog_alloc+0xa6/0x310 kernel/bpf/core.c:84 bpf_prog_load+0x2dc/0x1a80 kernel/bpf/syscall.c:1159 SYSC_bpf kernel/bpf/syscall.c:1737 [inline] SyS_bpf+0xab6/0x3ce0 kernel/bpf/syscall.c:1699 entry_SYSCALL_64_fastpath+0x1f/0x96 RIP: 0033:0x452879 RSP: 002b:00007f3f1b117be8 EFLAGS: 00000212 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 0000000000758020 RCX: 0000000000452879 RDX: 0000000000000030 RSI: 0000000020b4cfd0 RDI: 0000000000000005 RBP: 00007f3f1b117a20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000004b757e R13: 00007f3f1b117b58 R14: 00000000004b758e R15: 0000000000000000 syz-executor3: vmalloc: allocation failure: 4096 bytes, mode:0x14280c0(GFP_USER|__GFP_ZERO), nodemask=(null) syz-executor3 cpuset=/ mems_allowed=0 CPU: 1 PID: 15333 Comm: syz-executor3 Not tainted 4.14.0+ #190 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+0x194/0x257 lib/dump_stack.c:53 warn_alloc+0x19a/0x2b0 mm/page_alloc.c:3292 __vmalloc_node_range+0x4f0/0x650 mm/vmalloc.c:1775 __vmalloc_node mm/vmalloc.c:1804 [inline] __vmalloc+0x45/0x50 mm/vmalloc.c:1810 bpf_prog_alloc+0xa6/0x310 kernel/bpf/core.c:84 bpf_prog_load+0x2dc/0x1a80 kernel/bpf/syscall.c:1159 SYSC_bpf kernel/bpf/syscall.c:1737 [inline] SyS_bpf+0xab6/0x3ce0 kernel/bpf/syscall.c:1699 entry_SYSCALL_64_fastpath+0x1f/0x96 RIP: 0033:0x452879 RSP: 002b:00007f3f1b117be8 EFLAGS: 00000212 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 0000000000758020 RCX: 0000000000452879 RDX: 0000000000000030 RSI: 0000000020b4cfd0 RDI: 0000000000000005 RBP: 00007f3f1b117a20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000004b757e R13: 00007f3f1b117b58 R14: 00000000004b758e R15: 0000000000000000 Mem-Info: active_anon:125026 inactive_anon:55 isolated_anon:0 active_file:3713 inactive_file:6956 isolated_file:0 unevictable:0 dirty:126 writeback:0 unstable:0 slab_reclaimable:9960 slab_unreclaimable:99239 mapped:22886 shmem:65 pagetables:917 bounce:0 free:1361040 free_pcp:453 free_cma:0 Node 0 active_anon:485576kB inactive_anon:220kB active_file:14852kB inactive_file:27824kB unevictable:0kB isolated(anon):0kB isolated(file):0kB mapped:91544kB dirty:504kB writeback:0kB shmem:260kB shmem_thp: 0kB shmem_pmdmapped: 0kB anon_thp: 71680kB writeback_tmp:0kB unstable:0kB all_unreclaimable? no Node 0 DMA free:15908kB min:160kB low:200kB high:240kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB present:15992kB managed:15908kB mlocked:0kB kernel_stack:0kB pagetables:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB lowmem_reserve[]: 0 2882 6395 6395 Node 0 DMA32 free:2953236kB min:30384kB low:37980kB high:45576kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB present:3129332kB managed:2954000kB mlocked:0kB kernel_stack:0kB pagetables:0kB bounce:0kB free_pcp:764kB local_pcp:660kB free_cma:0kB lowmem_reserve[]: 0 0 3513 3513 Node 0 Normal free:2492556kB min:37032kB low:46288kB high:55544kB active_anon:485660kB inactive_anon:120kB active_file:14852kB inactive_file:27864kB unevictable:0kB writepending:548kB present:4718592kB managed:3597644kB mlocked:0kB kernel_stack:4000kB pagetables:3460kB bounce:0kB free_pcp:884kB local_pcp:388kB free_cma:0kB lowmem_reserve[]: 0 0 0 0 Node 0 DMA: 1*4kB (U) 0*8kB 0*16kB 1*32kB (U) 2*64kB (U) 1*128kB (U) 1*256kB (U) 0*512kB 1*1024kB (U) 1*2048kB (M) 3*4096kB (M) = 15908kB Node 0 DMA32: 5*4kB (UM) 2*8kB (UM) 5*16kB (UM) 3*32kB (UM) 5*64kB (UM) 2*128kB (M) 5*256kB (UM) 4*512kB (UM) 2*1024kB (UM) 3*2048kB (UM) 718*4096kB (M) = 2953236kB Node 0 Normal: 2720*4kB (UME) 1056*8kB (UE) 1472*16kB (UME) 1729*32kB (UME) 1647*64kB (UME) 636*128kB (UME) 349*256kB (UME) 121*512kB (UME) 38*1024kB (UME) 15*2048kB (UME) 479*4096kB (UM) = 2467936kB Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=2048kB 10718 total pagecache pages 0 pages in swap cache Swap cache stats: add 0, delete 0, find 0/0 Free swap = 0kB Total swap = 0kB 1965979 pages RAM 0 pages HighMem/MovableOnly 324091 pages reserved