last executing test programs: 0s ago: executing program 1 (id=2): r0 = syz_init_net_socket$nl_generic(0x10, 0x3, 0x10) r1 = syz_genetlink_get_family_id$nbd(&(0x7f0000000040), 0xffffffffffffffff) socketpair$nbd(0x1, 0x1, 0x0, &(0x7f0000000000)={0xffffffffffffffff}) sendmsg$NBD_CMD_CONNECT(r0, &(0x7f0000001ac0)={0x0, 0x0, &(0x7f0000001a80)={&(0x7f0000000a80)={0x48, r1, 0x1, 0xfffffffe, 0x0, {}, [@NBD_ATTR_SOCKETS={0x1c, 0x7, 0x0, 0x1, [{0xc, 0x1, 0x0, 0x1, {0x8, 0x1, r2}}, {0xc, 0x1, 0x0, 0x1, {0x8, 0x1, r2}}]}, @NBD_ATTR_SERVER_FLAGS={0xc, 0x5, 0xfb2e77a8993c191f}, @NBD_ATTR_SIZE_BYTES={0xc, 0x2, 0xffff}]}, 0x48}}, 0x20000000) kernel console output (not intermixed with test programs): Warning: Permanently added '[localhost]:27327' (ED25519) to the list of known hosts. syzkaller login: [ 415.653332][ T3196] cgroup: Unknown subsys name 'net' [ 416.313628][ T3196] cgroup: Unknown subsys name 'cpuset' [ 416.466522][ T3196] cgroup: Unknown subsys name 'rlimit' Setting up swapspace version 1, size = 127995904 bytes [ 463.947489][ T3196] Adding 124996k swap on ./swap-file. Priority:0 extents:1 across:124996k [ 544.473258][ T3205] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 544.532322][ T3205] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 546.725559][ T3204] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 546.902691][ T3204] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 555.934059][ T3205] hsr_slave_0: entered promiscuous mode [ 555.950424][ T3205] hsr_slave_1: entered promiscuous mode [ 557.824464][ T3204] hsr_slave_0: entered promiscuous mode [ 557.835761][ T3204] hsr_slave_1: entered promiscuous mode [ 557.843845][ T3204] debugfs: 'hsr0' already exists in 'hsr' [ 557.845894][ T3204] Cannot create hsr debugfs directory [ 563.122629][ T3205] netdevsim netdevsim1 netdevsim0: renamed from eth0 [ 563.249655][ T3205] netdevsim netdevsim1 netdevsim1: renamed from eth1 [ 563.367317][ T3205] netdevsim netdevsim1 netdevsim2: renamed from eth2 [ 563.484057][ T3205] netdevsim netdevsim1 netdevsim3: renamed from eth3 [ 565.376004][ T3204] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 565.579572][ T3204] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 565.829289][ T3204] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 565.975213][ T3204] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 571.224520][ T3205] 8021q: adding VLAN 0 to HW filter on device bond0 [ 574.182357][ T3204] 8021q: adding VLAN 0 to HW filter on device bond0 [ 596.844868][ T3205] veth0_vlan: entered promiscuous mode [ 597.299585][ T3205] veth1_vlan: entered promiscuous mode [ 598.913356][ T3205] veth0_macvtap: entered promiscuous mode [ 599.060506][ T3205] veth1_macvtap: entered promiscuous mode [ 600.083500][ T13] netdevsim netdevsim1 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0 [ 600.087037][ T13] netdevsim netdevsim1 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0 [ 600.089976][ T13] netdevsim netdevsim1 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0 [ 600.146391][ T13] netdevsim netdevsim1 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0 [ 602.678544][ T3205] soft_limit_in_bytes is deprecated and will be removed. Please report your usecase to linux-mm@kvack.org if you depend on this functionality. [ 604.142272][ T3204] veth0_vlan: entered promiscuous mode [ 604.798292][ T3204] veth1_vlan: entered promiscuous mode [ 607.357421][ T3204] veth0_macvtap: entered promiscuous mode [ 607.507274][ T3204] veth1_macvtap: entered promiscuous mode [ 609.119733][ T13] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0 [ 609.132335][ T13] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0 [ 609.134049][ T13] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0 [ 609.135358][ T13] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0 [ 611.938985][ T3905] [ 611.940051][ T3905] ====================================================== [ 611.941219][ T3905] WARNING: possible circular locking dependency detected [ 611.943126][ T3905] 6.17.0-rc1-syzkaller-g8f5ae30d69d7 #0 Not tainted [ 611.945629][ T3905] ------------------------------------------------------ [ 611.946890][ T3905] syz.1.2/3905 is trying to acquire lock: [ 611.947826][ T3905] ffffaf80126ab988 (&root->kernfs_rwsem){++++}-{4:4}, at: kernfs_remove+0x34/0x58 [ 611.952540][ T3905] [ 611.952540][ T3905] but task is already holding lock: [ 611.953591][ T3905] ffffaf801a433b58 (&q->q_usage_counter(io)#19){++++}-{0:0}, at: __blk_mq_update_nr_hw_queues+0x374/0x10b8 [ 611.956466][ T3905] [ 611.956466][ T3905] which lock already depends on the new lock. [ 611.956466][ T3905] [ 611.957573][ T3905] [ 611.957573][ T3905] the existing dependency chain (in reverse order) is: [ 611.958579][ T3905] [ 611.958579][ T3905] -> #2 (&q->q_usage_counter(io)#19){++++}-{0:0}: [ 611.960874][ T3905] lock_acquire+0x1ac/0x448 [ 611.962425][ T3905] blk_alloc_queue+0x5ae/0x6c6 [ 611.963717][ T3905] blk_mq_alloc_queue+0x168/0x25c [ 611.965040][ T3905] __blk_mq_alloc_disk+0x2a/0x118 [ 611.966362][ T3905] nbd_dev_add+0x45c/0xb2e [ 611.967408][ T3905] nbd_init+0x3f4/0x41a [ 611.968603][ T3905] do_one_initcall+0x1a2/0xae4 [ 611.969873][ T3905] kernel_init_freeable+0x6e4/0x7a4 [ 611.970994][ T3905] kernel_init+0x28/0x24c [ 611.972042][ T3905] ret_from_fork_kernel+0x2a/0xbb4 [ 611.973143][ T3905] ret_from_fork_kernel_asm+0x16/0x18 [ 611.974431][ T3905] [ 611.974431][ T3905] -> #1 (fs_reclaim){+.+.}-{0:0}: [ 611.977125][ T3905] lock_acquire+0x1ac/0x448 [ 611.978474][ T3905] fs_reclaim_acquire+0xd0/0x106 [ 611.979664][ T3905] kmem_cache_alloc_lru_noprof+0x4e/0x3c6 [ 611.981479][ T3905] alloc_inode+0xd2/0x210 [ 611.982559][ T3905] iget_locked+0x2c2/0x7a0 [ 611.983600][ T3905] kernfs_get_inode+0x46/0x3f8 [ 611.984847][ T3905] kernfs_get_tree+0x542/0x9d8 [ 611.986034][ T3905] sysfs_get_tree+0x3a/0x12c [ 611.987057][ T3905] vfs_get_tree+0x7e/0x318 [ 611.988243][ T3905] path_mount+0x6c8/0x1be4 [ 611.989497][ T3905] __riscv_sys_mount+0x5e0/0x776 [ 611.990878][ T3905] syscall_handler+0x94/0x118 [ 611.992085][ T3905] do_trap_ecall_u+0x396/0x530 [ 611.993154][ T3905] handle_exception+0x146/0x152 [ 611.994349][ T3905] [ 611.994349][ T3905] -> #0 (&root->kernfs_rwsem){++++}-{4:4}: [ 611.996257][ T3905] check_noncircular+0x132/0x146 [ 611.997571][ T3905] __lock_acquire+0x12b2/0x24ea [ 611.998829][ T3905] lock_acquire+0x1ac/0x448 [ 612.000058][ T3905] down_write+0x9c/0x19a [ 612.001302][ T3905] kernfs_remove+0x34/0x58 [ 612.002318][ T3905] sysfs_remove_dir+0xc8/0x10e [ 612.003414][ T3905] __kobject_del+0xe0/0x202 [ 612.004543][ T3905] kobject_del+0x42/0x66 [ 612.005674][ T3905] elevator_change_done+0x46e/0x55e [ 612.006676][ T3905] elevator_change+0x298/0x4d4 [ 612.007708][ T3905] elevator_set_none+0xa8/0x126 [ 612.008697][ T3905] __blk_mq_update_nr_hw_queues+0x504/0x10b8 [ 612.010096][ T3905] blk_mq_update_nr_hw_queues+0x42/0x66 [ 612.011361][ T3905] nbd_start_device+0x170/0xba8 [ 612.012384][ T3905] nbd_genl_connect+0xc1a/0x1b86 [ 612.013470][ T3905] genl_family_rcv_msg_doit+0x206/0x2e6 [ 612.014671][ T3905] genl_rcv_msg+0x514/0x78e [ 612.015758][ T3905] netlink_rcv_skb+0x206/0x3be [ 612.016859][ T3905] genl_rcv+0x36/0x4c [ 612.017938][ T3905] netlink_unicast+0x544/0x88a [ 612.019022][ T3905] netlink_sendmsg+0x860/0xdd8 [ 612.020090][ T3905] __sock_sendmsg+0xcc/0x160 [ 612.021303][ T3905] ____sys_sendmsg+0x63e/0x79c [ 612.022435][ T3905] ___sys_sendmsg+0x144/0x1e6 [ 612.023595][ T3905] __sys_sendmsg+0x188/0x246 [ 612.024727][ T3905] __riscv_sys_sendmsg+0x70/0xa2 [ 612.025940][ T3905] syscall_handler+0x94/0x118 [ 612.026990][ T3905] do_trap_ecall_u+0x396/0x530 [ 612.028033][ T3905] handle_exception+0x146/0x152 [ 612.029147][ T3905] [ 612.029147][ T3905] other info that might help us debug this: [ 612.029147][ T3905] [ 612.030431][ T3905] Chain exists of: [ 612.030431][ T3905] &root->kernfs_rwsem --> fs_reclaim --> &q->q_usage_counter(io)#19 [ 612.030431][ T3905] [ 612.033527][ T3905] Possible unsafe locking scenario: [ 612.033527][ T3905] [ 612.034540][ T3905] CPU0 CPU1 [ 612.035359][ T3905] ---- ---- [ 612.036202][ T3905] lock(&q->q_usage_counter(io)#19); [ 612.037773][ T3905] lock(fs_reclaim); [ 612.038990][ T3905] lock(&q->q_usage_counter(io)#19); [ 612.040513][ T3905] lock(&root->kernfs_rwsem); [ 612.041755][ T3905] [ 612.041755][ T3905] *** DEADLOCK *** [ 612.041755][ T3905] [ 612.042661][ T3905] 6 locks held by syz.1.2/3905: [ 612.043639][ T3905] #0: ffffffff8992d570 (cb_lock){++++}-{4:4}, at: genl_rcv+0x28/0x4c [ 612.046204][ T3905] #1: ffffffff8992d4a8 (genl_mutex){+.+.}-{4:4}, at: genl_rcv_msg+0x532/0x78e [ 612.048713][ T3905] #2: ffffaf801a5cc188 (&set->update_nr_hwq_lock){++++}-{4:4}, at: blk_mq_update_nr_hw_queues+0x2a/0x66 [ 612.051513][ T3905] #3: ffffaf801a5cc0d8 (&set->tag_list_lock){+.+.}-{4:4}, at: blk_mq_update_nr_hw_queues+0x3a/0x66 [ 612.054222][ T3905] #4: ffffaf801a433b58 (&q->q_usage_counter(io)#19){++++}-{0:0}, at: __blk_mq_update_nr_hw_queues+0x374/0x10b8 [ 612.057167][ T3905] #5: ffffaf801a433b90 (&q->q_usage_counter(queue)){+.+.}-{0:0}, at: __blk_mq_update_nr_hw_queues+0x374/0x10b8 [ 612.060087][ T3905] [ 612.060087][ T3905] stack backtrace: [ 612.061728][ T3905] CPU: 0 UID: 0 PID: 3905 Comm: syz.1.2 Not tainted 6.17.0-rc1-syzkaller-g8f5ae30d69d7 #0 PREEMPT [ 612.062374][ T3905] Hardware name: riscv-virtio,qemu (DT) [ 612.062966][ T3905] Call Trace: [ 612.063200][ T3905] [] dump_backtrace+0x2e/0x3c [ 612.063756][ T3905] [] show_stack+0x30/0x3c [ 612.064165][ T3905] [] dump_stack_lvl+0x12e/0x1a6 [ 612.064758][ T3905] [] dump_stack+0x1c/0x24 [ 612.065356][ T3905] [] print_circular_bug+0x254/0x29a [ 612.065983][ T3905] [] check_noncircular+0x132/0x146 [ 612.066573][ T3905] [] __lock_acquire+0x12b2/0x24ea [ 612.067134][ T3905] [] lock_acquire+0x1ac/0x448 [ 612.067742][ T3905] [] down_write+0x9c/0x19a [ 612.068297][ T3905] [] kernfs_remove+0x34/0x58 [ 612.068705][ T3905] [] sysfs_remove_dir+0xc8/0x10e [ 612.069235][ T3905] [] __kobject_del+0xe0/0x202 [ 612.069747][ T3905] [] kobject_del+0x42/0x66 [ 612.070233][ T3905] [] elevator_change_done+0x46e/0x55e [ 612.070677][ T3905] [] elevator_change+0x298/0x4d4 [ 612.071100][ T3905] [] elevator_set_none+0xa8/0x126 [ 612.071544][ T3905] [] __blk_mq_update_nr_hw_queues+0x504/0x10b8 [ 612.072164][ T3905] [] blk_mq_update_nr_hw_queues+0x42/0x66 [ 612.072779][ T3905] [] nbd_start_device+0x170/0xba8 [ 612.073289][ T3905] [] nbd_genl_connect+0xc1a/0x1b86 [ 612.073772][ T3905] [] genl_family_rcv_msg_doit+0x206/0x2e6 [ 612.074341][ T3905] [] genl_rcv_msg+0x514/0x78e [ 612.074882][ T3905] [] netlink_rcv_skb+0x206/0x3be [ 612.075400][ T3905] [] genl_rcv+0x36/0x4c [ 612.075919][ T3905] [] netlink_unicast+0x544/0x88a [ 612.076434][ T3905] [] netlink_sendmsg+0x860/0xdd8 [ 612.076977][ T3905] [] __sock_sendmsg+0xcc/0x160 [ 612.077564][ T3905] [] ____sys_sendmsg+0x63e/0x79c [ 612.078116][ T3905] [] ___sys_sendmsg+0x144/0x1e6 [ 612.078751][ T3905] [] __sys_sendmsg+0x188/0x246 [ 612.079341][ T3905] [] __riscv_sys_sendmsg+0x70/0xa2 [ 612.079958][ T3905] [] syscall_handler+0x94/0x118 [ 612.080451][ T3905] [] do_trap_ecall_u+0x396/0x530 [ 612.080975][ T3905] [] handle_exception+0x146/0x152 [ 613.627184][ T55] block nbd0: Receive control failed (result -32) [ 613.638599][ T55] block nbd0: Receive control failed (result -32) [ 613.675411][ T3905] nbd0: detected capacity change from 0 to 127 VM DIAGNOSIS: 17:17:30 Registers: info registers vcpu 0 CPU#0 V = 0 pc ffffffff8030702c mhartid 0000000000000000 mstatus 0000000a000001a0 hstatus 0000000200000000 vsstatus 0000000a00000000 mip 0000000000000220 mie 000000000000022a mideleg 0000000000001666 hideleg 0000000000000444 medeleg 0000000000f0b509 hedeleg 000000000000b10d mtvec 00000000800004f0 stvec ffffffff863ed450 vstvec 0000000000000000 mepc ffffffff8008f822 sepc ffffffff863c49ba vsepc 0000000000000000 mcause 0000000000000009 scause 8000000000000005 vscause 0000000000000000 mtval 0000000000000000 stval 0000000000000000 htval 0000000000000000 mtval2 0000000000000000 mscratch 000000008004a000 sscratch 0000000000000000 satp 901a30000009cfa7 x0/zero 0000000000000000 x1/ra ffffffff80306f94 x2/sp ffff8f8006006570 x3/gp ffffffff89c9e5c0 x4/tp ffffaf801bd48000 x5/t0 ffff8f80060063b4 x6/t1 fffffffef1394554 x7/t2 63722d302e37312e x8/s0 ffff8f80060065b0 x9/s1 0000000200000120 x10/a0 ffffffff91047920 x11/a1 ffffffff91047920 x12/a2 0000000000080000 x13/a3 ffffffff80306f94 x14/a4 0000000000000000 x15/a5 0000000000000001 x16/a6 0000000000000003 x17/a7 0000000000000003 x18/s2 0000000000000001 x19/s3 0000000200000120 x20/s4 ffffffff91047920 x21/s5 0000000000000000 x22/s6 1ffff1f000c00cb8 x23/s7 ffffffff87c357a0 x24/s8 ffff8f8006006788 x25/s9 ffffffff8030f4e8 x26/s10 0000000000000001 x27/s11 0000000000000006 x28/t3 ffffffff90e60fb7 x29/t4 fffffffef1394554 x30/t5 fffffffef1394555 x31/t6 ffff8f8006006198 fcsr 0000000000000000 f0/ft0 0000000000000000 f1/ft1 0000000000000000 f2/ft2 0000000000000000 f3/ft3 0000000000000000 f4/ft4 0000000000000000 f5/ft5 0000000000000000 f6/ft6 0000000000000000 f7/ft7 0000000000000000 f8/fs0 0000000000000000 f9/fs1 0000000000000000 f10/fa0 0000000000000000 f11/fa1 0000000000000000 f12/fa2 0000000000000000 f13/fa3 0000000000000000 f14/fa4 0000000000000000 f15/fa5 0000000000000000 f16/fa6 0000000000000000 f17/fa7 0000000000000000 f18/fs2 0000000000000000 f19/fs3 0000000000000000 f20/fs4 0000000000000000 f21/fs5 0000000000000000 f22/fs6 0000000000000000 f23/fs7 0000000000000000 f24/fs8 0000000000000000 f25/fs9 0000000000000000 f26/fs10 0000000000000000 f27/fs11 0000000000000000 f28/ft8 0000000000000000 f29/ft9 0000000000000000 f30/ft10 0000000000000000 f31/ft11 0000000000000000 info registers vcpu 1 CPU#1 V = 0 pc ffffffff8036dac2 mhartid 0000000000000001 mstatus 0000000a000000a0 hstatus 0000000200000000 vsstatus 0000000a00000000 mip 0000000000000000 mie 000000000000022a mideleg 0000000000001666 hideleg 0000000000000444 medeleg 0000000000f0b509 hedeleg 000000000000b10d mtvec 00000000800004f0 stvec ffffffff863ed450 vstvec 0000000000000000 mepc ffffffff863c47f6 sepc ffffffff85622524 vsepc 0000000000000000 mcause 8000000000000003 scause 8000000000000005 vscause 0000000000000000 mtval 0000000000000000 stval 0000000000000000 htval 0000000000000000 mtval2 0000000000000000 mscratch 0000000080048000 sscratch 0000000000000000 satp 901a40000009f027 x0/zero 0000000000000000 x1/ra ffffffff80569d02 x2/sp ffff8f8005ff78b0 x3/gp ffffffff89c9e5c0 x4/tp ffffaf801bd4b480 x5/t0 ffff8f8005ff7390 x6/t1 0000000000000001 x7/t2 81dc9bc41f658406 x8/s0 ffff8f8005ff78a0 x9/s1 ffffffff85622f58 x10/a0 0000000000000005 x11/a1 0000000000000000 x12/a2 ffff8f8005ff8000 x13/a3 ffffffff80078c18 x14/a4 0000000000000000 x15/a5 ffffaf801bd4c480 x16/a6 0000000000000003 x17/a7 ffffaf806ed5a083 x18/s2 ffff8f8005ff7860 x19/s3 0000000000000002 x20/s4 0000000000000000 x21/s5 dfffffff00000000 x22/s6 ffffffff85622f58 x23/s7 0000000000000001 x24/s8 dfffffff00000000 x25/s9 0000000000000000 x26/s10 ffffffff863ed450 x27/s11 0000000000000000 x28/t3 ffffffff883ed4c8 x29/t4 fffff5ef0ddab410 x30/t5 fffff5ef0ddab411 x31/t6 0000000000000002 fcsr 0000000000000000 f0/ft0 0000000000000000 f1/ft1 0000000000000000 f2/ft2 0000000000000000 f3/ft3 0000000000000000 f4/ft4 0000000000000000 f5/ft5 0000000000000000 f6/ft6 0000000000000000 f7/ft7 0000000000000000 f8/fs0 0000000000000000 f9/fs1 0000000000000000 f10/fa0 0000000000000000 f11/fa1 0000000000000000 f12/fa2 0000000000000000 f13/fa3 0000000000000000 f14/fa4 0000000000000000 f15/fa5 0000000000000000 f16/fa6 0000000000000000 f17/fa7 0000000000000000 f18/fs2 0000000000000000 f19/fs3 0000000000000000 f20/fs4 0000000000000000 f21/fs5 0000000000000000 f22/fs6 0000000000000000 f23/fs7 0000000000000000 f24/fs8 0000000000000000 f25/fs9 0000000000000000 f26/fs10 0000000000000000 f27/fs11 0000000000000000 f28/ft8 0000000000000000 f29/ft9 0000000000000000 f30/ft10 0000000000000000 f31/ft11 0000000000000000