INFO: task syz-executor.5:26127 blocked for more than 140 seconds. Not tainted 4.19.94-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D27768 26127 8136 0x00000004 Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x866/0x1dc0 kernel/sched/core.c:3515 schedule+0x92/0x1c0 kernel/sched/core.c:3559 __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:589 [inline] rwsem_down_write_failed+0x774/0xc30 kernel/locking/rwsem-xadd.c:618 call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:117 __down_write arch/x86/include/asm/rwsem.h:142 [inline] down_write+0x53/0x90 kernel/locking/rwsem.c:72 inode_lock include/linux/fs.h:747 [inline] lock_mount+0x8c/0x2e0 fs/namespace.c:2039 do_add_mount+0x27/0x380 fs/namespace.c:2416 do_new_mount fs/namespace.c:2483 [inline] do_mount+0x160a/0x2bc0 fs/namespace.c:2799 ksys_mount+0xdb/0x150 fs/namespace.c:3015 __do_sys_mount fs/namespace.c:3029 [inline] __se_sys_mount fs/namespace.c:3026 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3026 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45af49 Code: cc 48 8b 05 71 ce 7e 01 48 85 c0 74 6f 48 8b 05 cd c9 7e 01 48 85 c0 74 63 64 48 8b 04 25 f8 ff ff ff 48 85 c0 74 5a 48 8b 40 <30> 48 85 c0 74 4c 8b 88 38 01 00 00 85 c9 74 42 48 8b 88 c0 00 00 RSP: 002b:00007fecce8cbc78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 000000000045af49 RDX: 0000000020000140 RSI: 0000000020000000 RDI: 0000000000000000 RBP: 000000000075bfc8 R08: 0000000020000580 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fecce8cc6d4 R13: 00000000004c84ee R14: 00000000004e0740 R15: 00000000ffffffff INFO: task syz-executor.5:26337 blocked for more than 140 seconds. Not tainted 4.19.94-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D29976 26337 8136 0x00000004 Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x866/0x1dc0 kernel/sched/core.c:3515 schedule+0x92/0x1c0 kernel/sched/core.c:3559 __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:589 [inline] rwsem_down_write_failed+0x774/0xc30 kernel/locking/rwsem-xadd.c:618 call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:117 __down_write arch/x86/include/asm/rwsem.h:142 [inline] down_write+0x53/0x90 kernel/locking/rwsem.c:72 inode_lock include/linux/fs.h:747 [inline] vfs_setxattr+0x98/0x100 fs/xattr.c:218 setxattr+0x26f/0x380 fs/xattr.c:450 path_setxattr+0x197/0x1b0 fs/xattr.c:469 __do_sys_setxattr fs/xattr.c:484 [inline] __se_sys_setxattr fs/xattr.c:480 [inline] __x64_sys_setxattr+0xc4/0x150 fs/xattr.c:480 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45af49 Code: cc 48 8b 05 71 ce 7e 01 48 85 c0 74 6f 48 8b 05 cd c9 7e 01 48 85 c0 74 63 64 48 8b 04 25 f8 ff ff ff 48 85 c0 74 5a 48 8b 40 <30> 48 85 c0 74 4c 8b 88 38 01 00 00 85 c9 74 42 48 8b 88 c0 00 00 RSP: 002b:00007fecce8aac78 EFLAGS: 00000246 ORIG_RAX: 00000000000000bc RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 000000000045af49 RDX: 0000000000000000 RSI: 0000000020000380 RDI: 0000000020000340 RBP: 000000000075c070 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fecce8ab6d4 R13: 00000000004d5028 R14: 00000000004e5dc8 R15: 00000000ffffffff Showing all locks held in the system: 1 lock held by khungtaskd/1083: #0: 00000000286f392f (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e kernel/locking/lockdep.c:4438 1 lock held by rsyslogd/7954: #0: 000000000688ce06 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:767 2 locks held by getty/8076: #0: 000000007cf00b69 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000f45ff9ef (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154 2 locks held by getty/8077: #0: 00000000c9cab46d (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362 #1: 000000008b13e54f (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154 2 locks held by getty/8078: #0: 00000000160e2dda (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362 #1: 000000002e10626f (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154 2 locks held by getty/8079: #0: 0000000056706ba4 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000d3f9ba03 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154 2 locks held by getty/8080: #0: 000000005053873e (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000c3bdc2ec (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154 2 locks held by getty/8081: #0: 0000000018b12fd6 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000d7bb5dc7 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154 2 locks held by getty/8082: #0: 00000000b1dac4af (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000c3368187 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154 2 locks held by syz-executor.5/26092: #0: 000000000ede26be (sb_writers#17){.+.+}, at: sb_start_write include/linux/fs.h:1578 [inline] #0: 000000000ede26be (sb_writers#17){.+.+}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:360 #1: 00000000a873491b (&sb->s_type->i_mutex_key#21){+.+.}, at: inode_lock include/linux/fs.h:747 [inline] #1: 00000000a873491b (&sb->s_type->i_mutex_key#21){+.+.}, at: vfs_setxattr+0x98/0x100 fs/xattr.c:218 1 lock held by syz-executor.5/26127: #0: 00000000a873491b (&sb->s_type->i_mutex_key#21){+.+.}, at: inode_lock include/linux/fs.h:747 [inline] #0: 00000000a873491b (&sb->s_type->i_mutex_key#21){+.+.}, at: lock_mount+0x8c/0x2e0 fs/namespace.c:2039 2 locks held by syz-executor.5/26337: #0: 000000000ede26be (sb_writers#17){.+.+}, at: sb_start_write include/linux/fs.h:1578 [inline] #0: 000000000ede26be (sb_writers#17){.+.+}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:360 #1: 00000000a873491b (&sb->s_type->i_mutex_key#21){+.+.}, at: inode_lock include/linux/fs.h:747 [inline] #1: 00000000a873491b (&sb->s_type->i_mutex_key#21){+.+.}, at: vfs_setxattr+0x98/0x100 fs/xattr.c:218 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1083 Comm: khungtaskd Not tainted 4.19.94-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x197/0x210 lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x63/0xa4 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1b0/0x1f8 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline] watchdog+0x9df/0xee0 kernel/hung_task.c:287 kthread+0x354/0x420 kernel/kthread.c:246 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 31 Comm: kworker/u4:2 Not tainted 4.19.94-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_nc_worker RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:789 [inline] RIP: 0010:lock_release+0x45d/0xa30 kernel/locking/lockdep.c:3925 Code: 85 e3 03 00 00 48 c7 c0 c8 5b f2 88 48 ba 00 00 00 00 00 fc ff df 41 c7 84 24 7c 08 00 00 00 00 00 00 48 c1 e8 03 80 3c 10 00 <0f> 85 a7 03 00 00 48 83 3d ed e4 9f 07 00 0f 84 65 02 00 00 48 8b RSP: 0018:ffff8880a9a0fc18 EFLAGS: 00000046 RAX: 1ffffffff11e4b79 RBX: 1ffff11015341f89 RCX: 1ffff1101533f52e RDX: dffffc0000000000 RSI: 0000000000000003 RDI: ffff8880a99fa97c RBP: ffff8880a9a0fcd0 R08: ffff8880a99fa100 R09: 0000000000000002 R10: ffffed1015d04732 R11: ffff8880ae823993 R12: ffff8880a99fa100 R13: ffffffff873960ea R14: 0000000000000003 R15: ffff8880a9a0fca8 FS: 0000000000000000(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 00000000842e7000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rcu_lock_release include/linux/rcupdate.h:247 [inline] rcu_read_unlock include/linux/rcupdate.h:681 [inline] batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:423 [inline] batadv_nc_worker+0x225/0x760 net/batman-adv/network-coding.c:730 process_one_work+0x989/0x1750 kernel/workqueue.c:2153 worker_thread+0x98/0xe40 kernel/workqueue.c:2296 kthread+0x354/0x420 kernel/kthread.c:246 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415