RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fe7ed67e6d4 R13: 00000000004c9836 R14: 00000000004e1610 R15: 000000000000000a kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] PREEMPT SMP KASAN kobject: 'iosched' (0000000083b6c31d): kobject_cleanup, parent (null) CPU: 0 PID: 26076 Comm: syz-executor.2 Not tainted 4.19.88-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__read_once_size include/linux/compiler.h:193 [inline] RIP: 0010:__read_seqcount_begin include/linux/seqlock.h:113 [inline] RIP: 0010:raw_read_seqcount_begin include/linux/seqlock.h:148 [inline] RIP: 0010:hrtimer_active+0x11e/0x230 kernel/time/hrtimer.c:1327 Code: 48 39 c3 0f 84 d3 00 00 00 e8 2e 22 0f 00 48 8b 45 c8 80 38 00 0f 85 06 01 00 00 49 8b 5d 30 4c 8d 63 10 4c 89 e0 48 c1 e8 03 <42> 0f b6 14 38 4c 89 e0 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 RSP: 0018:ffff88804408f350 EFLAGS: 00010202 RAX: 0000000000000002 RBX: 0000000000000000 RCX: ffffc90005bbe000 RDX: 0000000000040000 RSI: ffffffff815c2112 RDI: ffff88807f14b040 RBP: ffff88804408f3a8 R08: ffff8880a48e0180 R09: ffffed1015d04733 R10: ffffed1015d04732 R11: ffff8880ae823993 R12: 0000000000000010 R13: ffff88807f14b040 R14: ffff88809b5f2e40 R15: dffffc0000000000 FS: 00007fe7ed67e700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000001cbb040 CR3: 00000000443f1000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 kobject: 'iosched' (0000000083b6c31d): calling ktype release DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: hrtimer_try_to_cancel+0x74/0x5b0 kernel/time/hrtimer.c:1144 kobject: 'iosched': free name hrtimer_cancel+0x20/0x40 kernel/time/hrtimer.c:1170 qdisc_watchdog_cancel+0x16/0x20 net/sched/sch_api.c:632 cbs_destroy+0x5e/0xd0 net/sched/sch_cbs.c:377 qdisc_create+0xaa6/0x1230 net/sched/sch_api.c:1203 tc_modify_qdisc+0x51b/0x1bd3 net/sched/sch_api.c:1571 kobject: '7:0' (00000000dfb98d23): kobject_add_internal: parent: 'bdi', set: 'devices' kobject: '7:0' (00000000dfb98d23): kobject_uevent_env rtnetlink_rcv_msg+0x463/0xb00 net/core/rtnetlink.c:4768 kobject: '7:0' (00000000dfb98d23): fill_kobj_path: path = '/devices/virtual/bdi/7:0' netlink_rcv_skb+0x17d/0x460 net/netlink/af_netlink.c:2454 kobject: 'loop0' (000000009962ecf2): kobject_add_internal: parent: 'block', set: 'devices' rtnetlink_rcv+0x1d/0x30 net/core/rtnetlink.c:4786 netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline] netlink_unicast+0x53a/0x730 net/netlink/af_netlink.c:1343 kobject: 'loop0' (000000009962ecf2): kobject_uevent_env kobject: 'loop0' (000000009962ecf2): kobject_uevent_env: uevent_suppress caused the event to drop! netlink_sendmsg+0x8ae/0xd70 net/netlink/af_netlink.c:1908 kobject: 'holders' (00000000fe7e0fac): kobject_add_internal: parent: 'loop0', set: '' sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xd7/0x130 net/socket.c:632 ___sys_sendmsg+0x803/0x920 net/socket.c:2115 kobject: 'slaves' (00000000f66cc67d): kobject_add_internal: parent: 'loop0', set: '' kobject: 'loop0' (000000009962ecf2): kobject_uevent_env __sys_sendmsg+0x105/0x1d0 net/socket.c:2153 __do_sys_sendmsg net/socket.c:2162 [inline] __se_sys_sendmsg net/socket.c:2160 [inline] __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2160 kobject: 'loop0' (000000009962ecf2): fill_kobj_path: path = '/devices/virtual/block/loop0' do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a6f9 kobject: 'queue' (00000000660e60f9): kobject_add_internal: parent: 'loop0', set: '' Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fe7ed67dc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fe7ed67dc90 RCX: 000000000045a6f9 RDX: 0000000000000000 RSI: 0000000020000280 RDI: 0000000000000003 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 kobject: 'mq' (0000000069fa7294): kobject_add_internal: parent: 'loop0', set: '' R10: 0000000000000000 R11: 0000000000000246 R12: 00007fe7ed67e6d4 R13: 00000000004c9836 R14: 00000000004e1610 R15: 000000000000000a Modules linked in: ---[ end trace d75d1a37b87a9e05 ]--- kobject: 'mq' (0000000069fa7294): kobject_uevent_env RIP: 0010:__read_once_size include/linux/compiler.h:193 [inline] RIP: 0010:__read_seqcount_begin include/linux/seqlock.h:113 [inline] RIP: 0010:raw_read_seqcount_begin include/linux/seqlock.h:148 [inline] RIP: 0010:hrtimer_active+0x11e/0x230 kernel/time/hrtimer.c:1327 kobject: 'mq' (0000000069fa7294): kobject_uevent_env: filter function caused the event to drop! Code: 48 39 c3 0f 84 d3 00 00 00 e8 2e 22 0f 00 48 8b 45 c8 80 38 00 0f 85 06 01 00 00 49 8b 5d 30 4c 8d 63 10 4c 89 e0 48 c1 e8 03 <42> 0f b6 14 38 4c 89 e0 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 kobject: '0' (0000000007a84626): kobject_add_internal: parent: 'mq', set: '' RSP: 0018:ffff88804408f350 EFLAGS: 00010202 kobject: 'cpu0' (00000000add89a04): kobject_add_internal: parent: '0', set: '' RAX: 0000000000000002 RBX: 0000000000000000 RCX: ffffc90005bbe000 kobject: 'cpu1' (00000000ccc108de): kobject_add_internal: parent: '0', set: '' RDX: 0000000000040000 RSI: ffffffff815c2112 RDI: ffff88807f14b040 kobject: 'queue' (00000000660e60f9): kobject_uevent_env RBP: ffff88804408f3a8 R08: ffff8880a48e0180 R09: ffffed1015d04733 kobject: 'queue' (00000000660e60f9): kobject_uevent_env: filter function caused the event to drop! R10: ffffed1015d04732 R11: ffff8880ae823993 R12: 0000000000000010 kobject: 'iosched' (000000002e3edd85): kobject_add_internal: parent: 'queue', set: '' R13: ffff88807f14b040 R14: ffff88809b5f2e40 R15: dffffc0000000000 kobject: 'iosched' (000000002e3edd85): kobject_uevent_env FS: 00007fe7ed67e700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 kobject: 'iosched' (000000002e3edd85): kobject_uevent_env: filter function caused the event to drop! CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 kobject: 'integrity' (00000000766252ad): kobject_add_internal: parent: 'loop0', set: '' CR2: 0000000000b76978 CR3: 00000000443f1000 CR4: 00000000001406f0 kobject: 'integrity' (00000000766252ad): kobject_uevent_env DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 kobject: 'integrity' (00000000766252ad): kobject_uevent_env: filter function caused the event to drop! DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 kobject: 'loop0' (00000000975dd791): kobject_cleanup, parent (null) kobject: 'loop1' (00000000b4b792d7): kobject_uevent_env kobject: 'loop0' (00000000975dd791): calling ktype release kobject: 'loop1' (00000000b4b792d7): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'queue' (000000001623fb65): kobject_cleanup, parent (null) kobject: 'integrity' (00000000766252ad): kobject_uevent_env kobject: 'queue' (000000001623fb65): calling ktype release kobject: 'loop5' (00000000c625ab79): kobject_uevent_env kobject: 'queue': free name kobject: 'loop5' (00000000c625ab79): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: '0' (00000000eaede633): kobject_cleanup, parent (null) kobject: 'loop0': free name kobject: '0' (00000000eaede633): calling ktype release kobject: 'integrity' (00000000766252ad): kobject_uevent_env: filter function caused the event to drop! kobject: '0': free name kobject: 'loop3' (000000005ec04d9f): kobject_uevent_env kobject: 'cpu0' (00000000702e070a): kobject_cleanup, parent (null)