program: r0 = syz_init_net_socket$nl_generic(0x10, 0x3, 0x10) mkdirat(0xffffffffffffff9c, &(0x7f00000001c0)='./proc\x00', 0x1ff) (async) mount(0x0, &(0x7f00000003c0)='./proc\x00', &(0x7f0000000400)='proc\x00', 0x0, 0x0) (async) mkdirat(0xffffffffffffff9c, &(0x7f0000000440)='./proc/1/root/var\x00', 0x1ff) (async) mkdirat(0xffffffffffffff9c, &(0x7f0000000480)='./proc/1/root/var/run\x00', 0x1ff) (async) r1 = socket$unix(0x1, 0x1, 0x0) bind$unix(r1, &(0x7f00000004c0)=@file={0x1, './proc/1/root/var/run/gssproxy.sock\x00'}, 0x6e) listen(r1, 0x5) (async) r2 = openat(0xffffffffffffff9c, &(0x7f0000000540)='./proc/net/rpc/use-gss-proxy\x00', 0x1, 0x0) write(r2, &(0x7f0000000580)='1', 0x1) (async) r3 = openat$fuse(0xffffffffffffff9c, &(0x7f0000000840), 0x42, 0x0) mount$fuse(0x0, &(0x7f0000000880)='./file0\x00', &(0x7f00000008c0), 0x0, &(0x7f0000000900)=ANY=[@ANYBLOB='fd=', @ANYRESHEX=r3, @ANYBLOB=',rootmode=00000000000000000040000,user_id=', @ANYRESDEC=0x0, @ANYBLOB=',group_id=', @ANYRESDEC=0x0]) (async) read$FUSE(r3, &(0x7f0000000980)={0x2020, 0x0, 0x0, 0x0, 0x0}, 0x2020) write$FUSE_INIT(r3, &(0x7f00000029c0)={0x50, 0x0, r4, {0x7, 0x2b, 0x0, 0x4f834c58, 0x43, 0x101, 0x7, 0xa15, 0x0, 0x0, 0x2, 0x7}}, 0x50) (async) syz_fuse_handle_req(r3, 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", 0x2000, &(0x7f0000004a40)={0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, &(0x7f0000004b00)={0x90, 0x0, 0xffffffff00000005, {0x5, 0xfffffffffffffffb, 0x1000000001000002, 0x6, 0x6, 0x5, {0x7, 0xc, 0x40000000000b, 0xfe2b25c, 0x7fffffffffc, 0x20000006a, 0x9, 0x0, 0x4010, 0xa000, 0xd244, r5, r6, 0x8, 0x2}}}, 0x0, 0x0, 0x0, 0x0, 0x0}) (async) mount$9p_fd(0x0, &(0x7f00000007c0)='./proc\x00', &(0x7f0000000800), 0x8000, &(0x7f0000004d00)={'trans=fd,', {'rfdno', 0x3d, r2}, 0x2c, {'wfdno', 0x3d, r2}, 0x2c, {[{@access_client}, {@debug={'debug', 0x3d, 0x3}}, {@noxattr}, {@ignoreqv}, {@version_u}, {@noxattr}, {@cache_none}], [{@subj_type={'subj_type', 0x3d, 'syzkaller\x00'}}, {@dont_hash}, {@defcontext={'defcontext', 0x3d, 'staff_u'}}, {@dont_measure}, {@func={'func', 0x3d, 'KEXEC_KERNEL_CHECK'}}, {@rootcontext={'rootcontext', 0x3d, 'sysadm_u'}}]}}) (async) mkdirat(0xffffffffffffff9c, &(0x7f00000005c0)='./sys\x00', 0x1ff) (async) mount(0x0, &(0x7f0000000600)='./sys\x00', &(0x7f0000000640)='sysfs\x00', 0x0, 0x0) (async) r7 = openat(0xffffffffffffff9c, &(0x7f0000000680)='./sys/kernel/sunrpc/xprt-switches/switch-0/add_xprt\x00', 0x1, 0x0) write(r7, &(0x7f00000006c0)='1', 0x1) (async) r8 = openat(0xffffffffffffff9c, &(0x7f0000000700)='./sys/kernel/sunrpc/xprt-switches/switch-0/xprt-1-local/xprt_state\x00', 0x1, 0x0) write(r8, &(0x7f0000000780)='o', 0x1) (async) r9 = syz_genetlink_get_family_id$netlbl_cipso(&(0x7f0000000000), r0) sendmsg$NLBL_CIPSOV4_C_ADD(r0, &(0x7f0000000040)={0x0, 0x0, &(0x7f0000000080)={&(0x7f0000000240)=ANY=[@ANYBLOB="7c010000", @ANYRES16=r9, @ANYBLOB="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"], 0x17c}, 0x1, 0x0, 0x0, 0x20008050}, 0x40480d4) bpf$PROG_LOAD_XDP(0x5, &(0x7f00000000c0)={0x6, 0x7, &(0x7f0000000180)=@framed={{}, [@jmp={0x6, 0x0, 0xc, 0x0, 0x0, 0x1, 0x8}, @func={0x85, 0x0, 0x1, 0x0, 0x1}, @exit, @call={0x85, 0x0, 0x0, 0xcf}]}, &(0x7f0000000200)='syzkaller\x00', 0x8, 0x0, 0x0, 0x41000, 0x0, '\x00', 0x0, 0x25, 0xffffffffffffffff, 0x8, 0x0, 0x0, 0x10, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x10, 0xd4}, 0x94) [ 102.593941][ T5311] Bluetooth: hci0: command tx timeout [ 102.736885][ T5357] netlink: 296 bytes leftover after parsing attributes in process `syz.0.0'. [ 102.775252][ T5355] [ 102.780094][ T5355] ============================================ [ 102.782740][ T5355] WARNING: possible recursive locking detected [ 102.785359][ T5355] syzkaller #0 Not tainted [ 102.787095][ T5355] -------------------------------------------- [ 102.789733][ T5355] syz.0.0/5355 is trying to acquire lock: [ 102.792196][ T5355] ffff888023f65d28 (kn->active#67){++++}-{0:0}, at: __kernfs_remove+0x493/0x910 [ 102.795841][ T5355] [ 102.795841][ T5355] but task is already holding lock: [ 102.798927][ T5355] ffff888023f65d28 (kn->active#67){++++}-{0:0}, at: kernfs_fop_write_iter+0x22b/0x540 [ 102.802937][ T5355] [ 102.802937][ T5355] other info that might help us debug this: [ 102.806138][ T5355] Possible unsafe locking scenario: [ 102.806138][ T5355] [ 102.810412][ T5355] CPU0 [ 102.811838][ T5355] ---- [ 102.813200][ T5355] lock(kn->active#67); [ 102.815046][ T5355] lock(kn->active#67); [ 102.816815][ T5355] [ 102.816815][ T5355] *** DEADLOCK *** [ 102.816815][ T5355] [ 102.820097][ T5355] May be due to missing lock nesting notation [ 102.820097][ T5355] [ 102.823447][ T5355] locks held by syz.0.0/5355: 4, last CPU#0: [ 102.826063][ T5355] #0: ffff888041e4cef0 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x118/0x160 [ 102.829929][ T5355] #1: ffff88803b92e478 (sb_writers#7){.+.+}-{0:0}, at: vfs_write+0x22b/0xba0 [ 102.833781][ T5355] #2: ffff888023e84c80 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x1d8/0x540 [ 102.837652][ T5355] #3: ffff888023f65d28 (kn->active#67){++++}-{0:0}, at: kernfs_fop_write_iter+0x22b/0x540 [ 102.841748][ T5355] [ 102.841748][ T5355] stack backtrace: [ 102.844124][ T5355] CPU: 0 UID: 0 PID: 5355 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) [ 102.847885][ T5355] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 102.852200][ T5355] Call Trace: [ 102.853694][ T5355] [ 102.855012][ T5355] dump_stack_lvl+0xe8/0x150 [ 102.857132][ T5355] print_deadlock_bug+0x27a/0x290 [ 102.859364][ T5355] __lock_acquire+0x25db/0x2de0 [ 102.861511][ T5355] ? wake_up_q+0x99/0xd0 [ 102.863490][ T5355] lock_acquire+0x115/0x350 [ 102.865572][ T5355] ? __kernfs_remove+0x493/0x910 [ 102.867873][ T5355] kernfs_drain+0x293/0x640 [ 102.869964][ T5355] ? __kernfs_remove+0x493/0x910 [ 102.872211][ T5355] ? __pfx_kernfs_drain+0x10/0x10 [ 102.874523][ T5355] ? __kernfs_remove+0x318/0x910 [ 102.876810][ T5355] ? up_write+0x19d/0x4a0 [ 102.878418][ T5355] __kernfs_remove+0x493/0x910 [ 102.880156][ T5355] ? kernfs_find_ns+0x701/0x800 [ 102.882239][ T5355] kernfs_remove_by_name_ns+0xc0/0x140 [ 102.884973][ T5355] sysfs_remove_group+0x101/0x2e0 [ 102.887236][ T5355] sysfs_remove_groups+0x54/0xb0 [ 102.889430][ T5355] __kobject_del+0x83/0x310 [ 102.891463][ T5355] kobject_del+0x45/0x60 [ 102.893324][ T5355] rpc_sysfs_xprt_switch_destroy+0x59/0x90 [ 102.895894][ T5355] xprt_switch_put+0x33d/0x3c0 [ 102.897913][ T5355] rpc_sysfs_xprt_switch_add_xprt_store+0x2d0/0x370 [ 102.900726][ T5355] ? lock_acquire+0x115/0x350 [ 102.902779][ T5355] ? __pfx_rpc_sysfs_xprt_switch_add_xprt_store+0x10/0x10 [ 102.905684][ T5355] ? sysfs_file_kobj+0x1a/0x230 [ 102.907752][ T5355] ? sysfs_file_kobj+0x1a/0x230 [ 102.909764][ T5355] ? sysfs_file_kobj+0x1e4/0x230 [ 102.911796][ T5355] ? sysfs_kf_write+0x166/0x260 [ 102.913849][ T5355] ? __pfx_sysfs_kf_write+0x10/0x10 [ 102.916271][ T5355] kernfs_fop_write_iter+0x3a4/0x540 [ 102.919027][ T5355] vfs_write+0x612/0xba0 [ 102.921291][ T5355] ? __pfx_vfs_write+0x10/0x10 [ 102.924078][ T5355] ? __fget_files+0x3a2/0x420 [ 102.926544][ T5355] ? __fget_files+0x2a/0x420 [ 102.928498][ T5355] ? fdget+0x1ac/0x250 [ 102.930165][ T5355] ksys_write+0x150/0x270 [ 102.932016][ T5355] ? __pfx_ksys_write+0x10/0x10 [ 102.934114][ T5355] do_syscall_64+0x166/0x520 [ 102.936176][ T5355] ? trace_irq_disable+0x3b/0x140 [ 102.938399][ T5355] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 102.941033][ T5355] ? clear_bhb_loop+0x70/0xc0 [ 102.943084][ T5355] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 102.945613][ T5355] RIP: 0033:0x7fe7fa19fb19 [ 102.947598][ T5355] Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 [ 102.955667][ T5355] RSP: 002b:00007fe7fb101fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 102.959250][ T5355] RAX: ffffffffffffffda RBX: 00007fe7fa425fa0 RCX: 00007fe7fa19fb19 [ 102.962737][ T5355] RDX: 0000000000000001 RSI: 00002000000006c0 RDI: 0000000000000007 [ 102.966126][ T5355] RBP: 00007fe7fa237b70 R08: 0000000000000000 R09: 0000000000000000 [ 102.969634][ T5355] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 102.973069][ T5355] R13: 00007fe7fa426038 R14: 00007fe7fa425fa0 R15: 00007ffdf27c1808 [ 102.976560][ T5355] [ 104.603939][ T5311] Bluetooth: hci0: command tx timeout [ 106.683852][ T5311] Bluetooth: hci0: command tx timeout [ 109.009980][ T1975] rxe_eth0 speed is unknown, defaulting to 1000