audit: type=1400 audit(1597578148.825:2818): avc: denied { dac_override } for pid=16074 comm="syz-executor.1" capability=1 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=cap_userns permissive=1 ====================================================== WARNING: possible circular locking dependency detected 4.14.193-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.1/16073 is trying to acquire lock: (&sig->cred_guard_mutex){+.+.}, at: [] lock_trace fs/proc/base.c:407 [inline] (&sig->cred_guard_mutex){+.+.}, at: [] proc_pid_personality+0x48/0x160 fs/proc/base.c:2914 but task is already holding lock: (&p->lock){+.+.}, at: [] seq_read+0xba/0x1120 fs/seq_file.c:165 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (&p->lock){+.+.}: __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893 seq_read+0xba/0x1120 fs/seq_file.c:165 proc_reg_read+0xee/0x1a0 fs/proc/inode.c:217 do_loop_readv_writev fs/read_write.c:695 [inline] do_loop_readv_writev fs/read_write.c:682 [inline] do_iter_read+0x3eb/0x5b0 fs/read_write.c:919 vfs_readv+0xc8/0x120 fs/read_write.c:981 kernel_readv fs/splice.c:361 [inline] default_file_splice_read+0x418/0x910 fs/splice.c:416 do_splice_to+0xfb/0x140 fs/splice.c:880 splice_direct_to_actor+0x207/0x730 fs/splice.c:952 do_splice_direct+0x164/0x210 fs/splice.c:1061 do_sendfile+0x47f/0xb30 fs/read_write.c:1441 SYSC_sendfile64 fs/read_write.c:1502 [inline] SyS_sendfile64+0xff/0x110 fs/read_write.c:1488 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb -> #2 (sb_writers#3){.+.+}: percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:36 [inline] percpu_down_read include/linux/percpu-rwsem.h:59 [inline] __sb_start_write+0x19a/0x2e0 fs/super.c:1363 sb_start_write include/linux/fs.h:1549 [inline] mnt_want_write+0x3a/0xb0 fs/namespace.c:386 ovl_do_remove+0x65/0xaf0 fs/overlayfs/dir.c:759 vfs_rmdir.part.0+0x144/0x390 fs/namei.c:3908 vfs_rmdir fs/namei.c:3893 [inline] do_rmdir+0x334/0x3c0 fs/namei.c:3968 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb -> #1 (&ovl_i_mutex_dir_key[depth]){++++}: down_read+0x36/0x80 kernel/locking/rwsem.c:24 inode_lock_shared include/linux/fs.h:729 [inline] do_last fs/namei.c:3333 [inline] path_openat+0x149b/0x2970 fs/namei.c:3569 do_filp_open+0x179/0x3c0 fs/namei.c:3603 do_open_execat+0xd3/0x450 fs/exec.c:849 do_execveat_common+0x711/0x1f30 fs/exec.c:1742 do_execve fs/exec.c:1847 [inline] SYSC_execve fs/exec.c:1928 [inline] SyS_execve+0x3b/0x50 fs/exec.c:1923 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb -> #0 (&sig->cred_guard_mutex){+.+.}: lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998 __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893 lock_trace fs/proc/base.c:407 [inline] proc_pid_personality+0x48/0x160 fs/proc/base.c:2914 proc_single_show+0xe7/0x150 fs/proc/base.c:761 seq_read+0x4cf/0x1120 fs/seq_file.c:237 do_loop_readv_writev fs/read_write.c:695 [inline] do_loop_readv_writev fs/read_write.c:682 [inline] do_iter_read+0x3eb/0x5b0 fs/read_write.c:919 vfs_readv+0xc8/0x120 fs/read_write.c:981 do_preadv fs/read_write.c:1065 [inline] SYSC_preadv fs/read_write.c:1115 [inline] SyS_preadv+0x15a/0x200 fs/read_write.c:1110 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb other info that might help us debug this: Chain exists of: &sig->cred_guard_mutex --> sb_writers#3 --> &p->lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&p->lock); lock(sb_writers#3); lock(&p->lock); lock(&sig->cred_guard_mutex); *** DEADLOCK *** 1 lock held by syz-executor.1/16073: #0: (&p->lock){+.+.}, at: [] seq_read+0xba/0x1120 fs/seq_file.c:165 stack backtrace: CPU: 1 PID: 16073 Comm: syz-executor.1 Not tainted 4.14.193-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+0x1b2/0x283 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 __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893 lock_trace fs/proc/base.c:407 [inline] proc_pid_personality+0x48/0x160 fs/proc/base.c:2914 proc_single_show+0xe7/0x150 fs/proc/base.c:761 seq_read+0x4cf/0x1120 fs/seq_file.c:237 do_loop_readv_writev fs/read_write.c:695 [inline] do_loop_readv_writev fs/read_write.c:682 [inline] do_iter_read+0x3eb/0x5b0 fs/read_write.c:919 vfs_readv+0xc8/0x120 fs/read_write.c:981 do_preadv fs/read_write.c:1065 [inline] SYSC_preadv fs/read_write.c:1115 [inline] SyS_preadv+0x15a/0x200 fs/read_write.c:1110 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x45d239 RSP: 002b:00007fe701d7bc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000127 RAX: ffffffffffffffda RBX: 0000000000024ac0 RCX: 000000000045d239 RDX: 000000000000037d RSI: 0000000020000500 RDI: 0000000000000003 RBP: 000000000118cf90 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c R13: 00007ffc1b1548df R14: 00007fe701d7c9c0 R15: 000000000118cf4c audit: type=1400 audit(1597578149.415:2819): avc: denied { sys_ptrace } for pid=16071 comm="syz-executor.1" capability=19 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=cap_userns permissive=1 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=106 sclass=netlink_route_socket pid=16117 comm=syz-executor.4 audit: type=1804 audit(1597578149.485:2820): pid=16103 uid=0 auid=0 ses=4 subj=system_u:system_r:kernel_t:s0 op="invalid_pcr" cause="open_writers" comm="syz-executor.3" name="/root/syzkaller-testdir567530677/syzkaller.IPQ2m1/130/bus" dev="sda1" ino=16218 res=1 sp0: Synchronizing with TNC audit: type=1804 audit(1597578149.505:2821): pid=16103 uid=0 auid=0 ses=4 subj=system_u:system_r:kernel_t:s0 op="invalid_pcr" cause="open_writers" comm="syz-executor.3" name="/root/syzkaller-testdir567530677/syzkaller.IPQ2m1/130/bus" dev="sda1" ino=16218 res=1 audit: type=1800 audit(1597578149.505:2822): pid=16103 uid=0 auid=0 ses=4 subj=system_u:system_r:kernel_t:s0 op="collect_data" cause="failed(directio)" comm="syz-executor.3" name="file0" dev="sda1" ino=16219 res=0 audit: type=1800 audit(1597578149.555:2823): pid=16118 uid=0 auid=0 ses=4 subj=system_u:system_r:kernel_t:s0 op="collect_data" cause="failed" comm="syz-executor.2" name="bus" dev="sda1" ino=16224 res=0 audit: type=1804 audit(1597578149.685:2824): pid=16103 uid=0 auid=0 ses=4 subj=system_u:system_r:kernel_t:s0 op="invalid_pcr" cause="ToMToU" comm="syz-executor.3" name="/root/syzkaller-testdir567530677/syzkaller.IPQ2m1/130/bus" dev="sda1" ino=16218 res=1 netlink: 20 bytes leftover after parsing attributes in process `syz-executor.4'. audit: type=1804 audit(1597578149.875:2825): pid=16227 uid=0 auid=0 ses=4 subj=system_u:system_r:kernel_t:s0 op="invalid_pcr" cause="open_writers" comm="syz-executor.3" name="/root/syzkaller-testdir567530677/syzkaller.IPQ2m1/131/file0" dev="sda1" ino=16226 res=1 audit: type=1800 audit(1597578149.915:2826): pid=16227 uid=0 auid=0 ses=4 subj=system_u:system_r:kernel_t:s0 op="collect_data" cause="failed(directio)" comm="syz-executor.3" name="file0" dev="sda1" ino=16226 res=0 audit: type=1800 audit(1597578149.935:2827): pid=16239 uid=0 auid=0 ses=4 subj=system_u:system_r:kernel_t:s0 op="collect_data" cause="failed(directio)" comm="syz-executor.3" name="file0" dev="sda1" ino=16226 res=0 sp0: Synchronizing with TNC dlm: plock device version mismatch: kernel (1.2.0), user (1986356271.1768060463.35) dlm: plock device version mismatch: kernel (1.2.0), user (1986356271.1768060463.35) sp0: Synchronizing with TNC sp0: Synchronizing with TNC sp0: Synchronizing with TNC SELinux: unrecognized netlink message: protocol=0 nlmsg_type=129 sclass=netlink_route_socket pid=16409 comm=syz-executor.2 netlink: 20 bytes leftover after parsing attributes in process `syz-executor.4'. sp0: Synchronizing with TNC sp0: Synchronizing with TNC sp0: Synchronizing with TNC sp0: Synchronizing with TNC sp0: Synchronizing with TNC sp0: Synchronizing with TNC ptrace attach of "/root/syz-executor.3"[16562] was attempted by "/root/syz-executor.3"[16564] sg_write: data in/out 940998968/1 bytes for SCSI command 0xb2-- guessing data in; program syz-executor.3 not setting count and/or reply_len properly PF_BRIDGE: RTM_NEWNEIGH with unknown ifindex netlink: 24 bytes leftover after parsing attributes in process `syz-executor.1'. netlink: 20 bytes leftover after parsing attributes in process `syz-executor.1'. netlink: 20 bytes leftover after parsing attributes in process `syz-executor.1'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.1'. PF_BRIDGE: RTM_NEWNEIGH with unknown ifindex sg_write: data in/out 940998968/1 bytes for SCSI command 0xb2-- guessing data in; program syz-executor.3 not setting count and/or reply_len properly sg_write: data in/out 940998968/1 bytes for SCSI command 0xb2-- guessing data in; program syz-executor.3 not setting count and/or reply_len properly sg_write: data in/out 940998968/1 bytes for SCSI command 0xb2-- guessing data in; program syz-executor.3 not setting count and/or reply_len properly SELinux: unrecognized netlink message: protocol=0 nlmsg_type=4320 sclass=netlink_route_socket pid=16886 comm=syz-executor.4 net_ratelimit: 2 callbacks suppressed GRED: Unable to relocate VQ 0x0 after dequeue, screwing up backlog netlink: 36 bytes leftover after parsing attributes in process `syz-executor.0'. sg_write: data in/out 940998968/1 bytes for SCSI command 0xb2-- guessing data in; program syz-executor.3 not setting count and/or reply_len properly SELinux: unrecognized netlink message: protocol=0 nlmsg_type=4320 sclass=netlink_route_socket pid=16886 comm=syz-executor.4 sg_write: data in/out 940998968/1 bytes for SCSI command 0xb2-- guessing data in; program syz-executor.3 not setting count and/or reply_len properly Bluetooth: hci2 command 0x0406 tx timeout Bluetooth: hci0 command 0x0406 tx timeout Bluetooth: hci4 command 0x0406 tx timeout Bluetooth: hci1 command 0x0406 tx timeout Bluetooth: hci5 command 0x0406 tx timeout Bluetooth: hci3 command 0x0406 tx timeout sg_write: data in/out 940998968/1 bytes for SCSI command 0xb2-- guessing data in; program syz-executor.3 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: 17204 Comm: syz-executor.5 Not tainted 4.14.193-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+0x1b2/0x283 lib/dump_stack.c:58 fail_dump lib/fault-inject.c:51 [inline] should_fail.cold+0x10a/0x154 lib/fault-inject.c:149 should_failslab+0xd6/0x130 mm/failslab.c:32 slab_pre_alloc_hook mm/slab.h:421 [inline] slab_alloc_node mm/slab.c:3297 [inline] kmem_cache_alloc_node_trace+0x25a/0x400 mm/slab.c:3659 __do_kmalloc_node mm/slab.c:3681 [inline] __kmalloc_node+0x38/0x70 mm/slab.c:3689 kmalloc_node include/linux/slab.h:530 [inline] kvmalloc_node+0x46/0xd0 mm/util.c:397 kvmalloc include/linux/mm.h:531 [inline] kvzalloc include/linux/mm.h:539 [inline] alloc_netdev_mqs+0x76/0xb70 net/core/dev.c:8103 sixpack_open+0xdd/0xc70 drivers/net/hamradio/6pack.c:572 tty_ldisc_open+0x6c/0xb0 drivers/tty/tty_ldisc.c:481 tty_set_ldisc+0x287/0x5d0 drivers/tty/tty_ldisc.c:606 tiocsetd drivers/tty/tty_io.c:2351 [inline] tty_ioctl+0xa2a/0x13c0 drivers/tty/tty_io.c:2595 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x45d239 RSP: 002b:00007fe5b839bc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000018980 RCX: 000000000045d239 RDX: 0000000020000000 RSI: 0000000000005423 RDI: 0000000000000004 RBP: 00007fe5b839bca0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe61aa943f R14: 00007fe5b839c9c0 R15: 000000000118cf4c sg_write: data in/out 940998968/1 bytes for SCSI command 0xb2-- guessing data in; program syz-executor.3 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: 17226 Comm: syz-executor.5 Not tainted 4.14.193-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+0x1b2/0x283 lib/dump_stack.c:58 fail_dump lib/fault-inject.c:51 [inline] should_fail.cold+0x10a/0x154 lib/fault-inject.c:149 should_failslab+0xd6/0x130 mm/failslab.c:32 slab_pre_alloc_hook mm/slab.h:421 [inline] slab_alloc mm/slab.c:3376 [inline] kmem_cache_alloc_trace+0x47/0x3d0 mm/slab.c:3616 kmalloc include/linux/slab.h:488 [inline] __hw_addr_create_ex+0x5b/0x300 net/core/dev_addr_lists.c:34 __hw_addr_add_ex+0x1c1/0x290 net/core/dev_addr_lists.c:80 __hw_addr_add net/core/dev_addr_lists.c:88 [inline] dev_addr_init+0xfb/0x1b0 net/core/dev_addr_lists.c:371 alloc_netdev_mqs+0x11d/0xb70 net/core/dev.c:8114 sixpack_open+0xdd/0xc70 drivers/net/hamradio/6pack.c:572 tty_ldisc_open+0x6c/0xb0 drivers/tty/tty_ldisc.c:481 tty_set_ldisc+0x287/0x5d0 drivers/tty/tty_ldisc.c:606 tiocsetd drivers/tty/tty_io.c:2351 [inline] tty_ioctl+0xa2a/0x13c0 drivers/tty/tty_io.c:2595 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x45d239 RSP: 002b:00007fe5b839bc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000018980 RCX: 000000000045d239 RDX: 0000000020000000 RSI: 0000000000005423 RDI: 0000000000000004 RBP: 00007fe5b839bca0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffe61aa943f R14: 00007fe5b839c9c0 R15: 000000000118cf4c FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 1 PID: 17256 Comm: syz-executor.5 Not tainted 4.14.193-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+0x1b2/0x283 lib/dump_stack.c:58 fail_dump lib/fault-inject.c:51 [inline] should_fail.cold+0x10a/0x154 lib/fault-inject.c:149 should_failslab+0xd6/0x130 mm/failslab.c:32 slab_pre_alloc_hook mm/slab.h:421 [inline] slab_alloc_node mm/slab.c:3297 [inline] kmem_cache_alloc_node_trace+0x25a/0x400 mm/slab.c:3659 __do_kmalloc_node mm/slab.c:3681 [inline] __kmalloc_node+0x38/0x70 mm/slab.c:3689 kmalloc_node include/linux/slab.h:530 [inline] kvmalloc_node+0x46/0xd0 mm/util.c:397 kvmalloc include/linux/mm.h:531 [inline] kvzalloc include/linux/mm.h:539 [inline] netif_alloc_netdev_queues net/core/dev.c:7525 [inline] alloc_netdev_mqs+0x5e5/0xb70 net/core/dev.c:8146 sixpack_open+0xdd/0xc70 drivers/net/hamradio/6pack.c:572 tty_ldisc_open+0x6c/0xb0 drivers/tty/tty_ldisc.c:481 tty_set_ldisc+0x287/0x5d0 drivers/tty/tty_ldisc.c:606 tiocsetd drivers/tty/tty_io.c:2351 [inline] tty_ioctl+0xa2a/0x13c0 drivers/tty/tty_io.c:2595 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x45d239 RSP: 002b:00007fe5b839bc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000018980 RCX: 000000000045d239 RDX: 0000000020000000 RSI: 0000000000005423 RDI: 0000000000000004 RBP: 00007fe5b839bca0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002 R13: 00007ffe61aa943f R14: 00007fe5b839c9c0 R15: 000000000118cf4c sg_write: data in/out 940998968/1 bytes for SCSI command 0xb2-- guessing data in; program syz-executor.3 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: 17275 Comm: syz-executor.5 Not tainted 4.14.193-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+0x1b2/0x283 lib/dump_stack.c:58 fail_dump lib/fault-inject.c:51 [inline] should_fail.cold+0x10a/0x154 lib/fault-inject.c:149 should_failslab+0xd6/0x130 mm/failslab.c:32 slab_pre_alloc_hook mm/slab.h:421 [inline] slab_alloc_node mm/slab.c:3297 [inline] kmem_cache_alloc_node_trace+0x25a/0x400 mm/slab.c:3659 __do_kmalloc_node mm/slab.c:3681 [inline] __kmalloc_node+0x38/0x70 mm/slab.c:3689 kmalloc_node include/linux/slab.h:530 [inline] kvmalloc_node+0x46/0xd0 mm/util.c:397 kvmalloc include/linux/mm.h:531 [inline] kvzalloc include/linux/mm.h:539 [inline] netif_alloc_rx_queues net/core/dev.c:7485 [inline] alloc_netdev_mqs+0x75c/0xb70 net/core/dev.c:8152 sixpack_open+0xdd/0xc70 drivers/net/hamradio/6pack.c:572 overlayfs: unrecognized mount option "e1" or missing value tty_ldisc_open+0x6c/0xb0 drivers/tty/tty_ldisc.c:481 tty_set_ldisc+0x287/0x5d0 drivers/tty/tty_ldisc.c:606 tiocsetd drivers/tty/tty_io.c:2351 [inline] tty_ioctl+0xa2a/0x13c0 drivers/tty/tty_io.c:2595 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x45d239 RSP: 002b:00007fe5b839bc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000018980 RCX: 000000000045d239 RDX: 0000000020000000 RSI: 0000000000005423 RDI: 0000000000000004 RBP: 00007fe5b839bca0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003 R13: 00007ffe61aa943f R14: 00007fe5b839c9c0 R15: 000000000118cf4c FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 1 PID: 17294 Comm: syz-executor.5 Not tainted 4.14.193-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+0x1b2/0x283 lib/dump_stack.c:58 fail_dump lib/fault-inject.c:51 [inline] should_fail.cold+0x10a/0x154 lib/fault-inject.c:149 should_failslab+0xd6/0x130 mm/failslab.c:32 slab_pre_alloc_hook mm/slab.h:421 [inline] slab_alloc mm/slab.c:3376 [inline] __do_kmalloc mm/slab.c:3718 [inline] __kmalloc+0x2c1/0x400 mm/slab.c:3729 kmalloc include/linux/slab.h:493 [inline] sixpack_open+0x355/0xc70 drivers/net/hamradio/6pack.c:590 tty_ldisc_open+0x6c/0xb0 drivers/tty/tty_ldisc.c:481 tty_set_ldisc+0x287/0x5d0 drivers/tty/tty_ldisc.c:606 tiocsetd drivers/tty/tty_io.c:2351 [inline] tty_ioctl+0xa2a/0x13c0 drivers/tty/tty_io.c:2595 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x45d239 RSP: 002b:00007fe5b839bc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000018980 RCX: 000000000045d239 RDX: 0000000020000000 RSI: 0000000000005423 RDI: 0000000000000004 RBP: 00007fe5b839bca0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004 R13: 00007ffe61aa943f R14: 00007fe5b839c9c0 R15: 000000000118cf4c PF_BRIDGE: RTM_NEWNEIGH with unknown ifindex FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 1 PID: 17314 Comm: syz-executor.5 Not tainted 4.14.193-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+0x1b2/0x283 lib/dump_stack.c:58 fail_dump lib/fault-inject.c:51 [inline] should_fail.cold+0x10a/0x154 lib/fault-inject.c:149 should_failslab+0xd6/0x130 mm/failslab.c:32 slab_pre_alloc_hook mm/slab.h:421 [inline] slab_alloc mm/slab.c:3376 [inline] __do_kmalloc mm/slab.c:3718 [inline] __kmalloc+0x2c1/0x400 mm/slab.c:3729 sg_write: data in/out 940998968/1 bytes for SCSI command 0xb2-- guessing data in; program syz-executor.3 not setting count and/or reply_len properly kmalloc include/linux/slab.h:493 [inline] sixpack_open+0x365/0xc70 drivers/net/hamradio/6pack.c:591 tty_ldisc_open+0x6c/0xb0 drivers/tty/tty_ldisc.c:481 tty_set_ldisc+0x287/0x5d0 drivers/tty/tty_ldisc.c:606 tiocsetd drivers/tty/tty_io.c:2351 [inline] tty_ioctl+0xa2a/0x13c0 drivers/tty/tty_io.c:2595 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x45d239 RSP: 002b:00007fe5b839bc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000018980 RCX: 000000000045d239