device lo entered promiscuous mode Y4`Ҙ: renamed from lo INFO: task syz-executor2:4950 blocked for more than 140 seconds. Not tainted 4.14.94+ #12 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor2 D25568 4950 1831 0x00000004 Call Trace: schedule+0x92/0x1c0 kernel/sched/core.c:3490 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:269 [inline] rwsem_down_read_failed+0x21f/0x3c0 kernel/locking/rwsem-xadd.c:286 call_rwsem_down_read_failed+0x14/0x30 arch/x86/lib/rwsem.S:94 __down_read arch/x86/include/asm/rwsem.h:66 [inline] down_read+0x45/0xa0 kernel/locking/rwsem.c:26 inode_lock_shared include/linux/fs.h:725 [inline] ext4_direct_IO_read fs/ext4/inode.c:3798 [inline] ext4_direct_IO+0x546/0x2800 fs/ext4/inode.c:3862 generic_file_read_iter+0x24a/0x1a90 mm/filemap.c:2242 ext4_file_read_iter+0x119/0x180 fs/ext4/file.c:75 call_read_iter include/linux/fs.h:1778 [inline] generic_file_splice_read+0x30d/0x540 fs/splice.c:307 do_splice_to+0xfd/0x150 fs/splice.c:880 splice_direct_to_actor+0x21a/0x760 fs/splice.c:952 do_splice_direct+0x177/0x240 fs/splice.c:1061 do_sendfile+0x493/0xb20 fs/read_write.c:1438 SYSC_sendfile64 fs/read_write.c:1493 [inline] SyS_sendfile64+0xab/0x140 fs/read_write.c:1485 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289 Showing all locks held in the system: 1 lock held by khungtaskd/23: #0: (tasklist_lock){.+.?}, at: [] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4541 2 locks held by getty/1744: #0: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:275 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1f7/0x1700 drivers/tty/n_tty.c:2156 2 locks held by syz-executor2/4950: #0: (sb_writers#4){.+.+}, at: [] file_start_write include/linux/fs.h:2726 [inline] #0: (sb_writers#4){.+.+}, at: [] do_sendfile+0x88f/0xb20 fs/read_write.c:1437 #1: (&sb->s_type->i_mutex_key#9){++++}, at: [] inode_lock_shared include/linux/fs.h:725 [inline] #1: (&sb->s_type->i_mutex_key#9){++++}, at: [] ext4_direct_IO_read fs/ext4/inode.c:3798 [inline] #1: (&sb->s_type->i_mutex_key#9){++++}, at: [] ext4_direct_IO+0x546/0x2800 fs/ext4/inode.c:3862 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 23 Comm: khungtaskd Not tainted 4.14.94+ #12 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0xb9/0x10e lib/dump_stack.c:53 nmi_cpu_backtrace.cold+0x47/0x86 lib/nmi_backtrace.c:101 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 9533 Comm: syz-executor5 Not tainted 4.14.94+ #12 task: ffff8881a2564680 task.stack: ffff8881a1ee0000 RIP: 0010:__sanitizer_cov_trace_pc+0x23/0x60 kernel/kcov.c:68 RSP: 0018:ffff8881a1ee7bc8 EFLAGS: 00000246 RAX: ffff8881a2564680 RBX: 0000000033f456a1 RCX: 1ffffffff2202328 RDX: 0000000000000000 RSI: ffffffff9094ffc0 RDI: ffffffff90950000 RBP: ffffffff90950000 R08: 0000000000000002 R09: 0000000000020025 R10: ffff8881a2564eb0 R11: 0000000000000001 R12: 0000000000000000 R13: ffffffff9094ffc0 R14: ffff8881a1ee7ce8 R15: ffffc900000c0030 FS: 00007faf2f9bf700(0000) GS:ffff8881dba00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000001d4c678 CR3: 00000001c8a8c001 CR4: 00000000001606b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: check_preemption_disabled+0x30/0x1f0 lib/smp_processor_id.c:16 rcu_dynticks_curr_cpu_in_eqs kernel/rcu/tree.c:360 [inline] rcu_is_watching+0x11/0xb0 kernel/rcu/tree.c:1130 rcu_read_unlock include/linux/rcupdate.h:683 [inline] bpf_test_run_one net/bpf/test_run.c:21 [inline] bpf_test_run+0x1d8/0x340 net/bpf/test_run.c:36 bpf_prog_test_run_xdp+0x169/0x270 net/bpf/test_run.c:167 bpf_prog_test_run kernel/bpf/syscall.c:1343 [inline] SYSC_bpf kernel/bpf/syscall.c:1615 [inline] SyS_bpf+0xe9f/0x3690 kernel/bpf/syscall.c:1560 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289 Code: 00 00 e9 90 ed ff ff 90 65 48 8b 04 25 c0 de 01 00 48 85 c0 74 1a 65 8b 15 fb 4e 31 71 81 e2 00 01 1f 00 75 0b 8b 90 a8 11 00 00 <83> fa 01 74 01 c3 48 c7 c2 00 00 00 81 48 81 ea 00 00 a0 8e 48