gfs2: fsid=syz:syz.0: first mount done, others may mount gfs2: fsid=syz:syz.0: can't create logd thread: -4 ================================================================== BUG: KASAN: slab-use-after-free in workqueue_sysfs_unregister kernel/workqueue.c:7413 [inline] BUG: KASAN: slab-use-after-free in destroy_workqueue+0x41/0xc40 kernel/workqueue.c:5822 Read of size 8 at addr ffff88802417c928 by task syz.2.93/5587 CPU: 1 UID: 0 PID: 5587 Comm: syz.2.93 Not tainted 6.11.0-syzkaller-08829-gaf9c191ac2a0 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:377 [inline] print_report+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 workqueue_sysfs_unregister kernel/workqueue.c:7413 [inline] destroy_workqueue+0x41/0xc40 kernel/workqueue.c:5822 gfs2_fill_super+0x128a/0x2500 fs/gfs2/ops_fstype.c:1310 get_tree_bdev+0x3f9/0x570 fs/super.c:1635 gfs2_get_tree+0x54/0x220 fs/gfs2/ops_fstype.c:1329 vfs_get_tree+0x92/0x2b0 fs/super.c:1800 do_new_mount+0x2be/0xb40 fs/namespace.c:3507 do_mount fs/namespace.c:3847 [inline] __do_sys_mount fs/namespace.c:4055 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4032 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fba9d77f69a Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fba9e4abe68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fba9e4abef0 RCX: 00007fba9d77f69a RDX: 0000000020037f40 RSI: 0000000020037f80 RDI: 00007fba9e4abeb0 RBP: 0000000020037f40 R08: 00007fba9e4abef0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000020037f80 R13: 00007fba9e4abeb0 R14: 0000000000037f14 R15: 0000000020037fc0 Allocated by task 5587: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:377 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:257 [inline] __do_kmalloc_node mm/slub.c:4265 [inline] __kmalloc_noprof+0x1fc/0x400 mm/slub.c:4277 kmalloc_noprof include/linux/slab.h:882 [inline] kzalloc_noprof include/linux/slab.h:1014 [inline] __alloc_workqueue+0x10a/0x1f20 kernel/workqueue.c:5655 alloc_workqueue+0xd6/0x210 kernel/workqueue.c:5758 gfs2_fill_super+0x1149/0x2500 fs/gfs2/ops_fstype.c:1191 get_tree_bdev+0x3f9/0x570 fs/super.c:1635 gfs2_get_tree+0x54/0x220 fs/gfs2/ops_fstype.c:1329 vfs_get_tree+0x92/0x2b0 fs/super.c:1800 do_new_mount+0x2be/0xb40 fs/namespace.c:3507 do_mount fs/namespace.c:3847 [inline] __do_sys_mount fs/namespace.c:4055 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4032 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 0: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x59/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:2343 [inline] slab_free mm/slub.c:4580 [inline] kfree+0x1a0/0x440 mm/slub.c:4728 rcu_do_batch kernel/rcu/tree.c:2567 [inline] rcu_core+0xaac/0x17a0 kernel/rcu/tree.c:2823 handle_softirqs+0x2c7/0x980 kernel/softirq.c:554 __do_softirq kernel/softirq.c:588 [inline] invoke_softirq kernel/softirq.c:428 [inline] __irq_exit_rcu+0xf4/0x1c0 kernel/softirq.c:637 irq_exit_rcu+0x9/0x30 kernel/softirq.c:649 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1037 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1037 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 Last potentially related work creation: kasan_save_stack+0x3f/0x60 mm/kasan/common.c:47 __kasan_record_aux_stack+0xac/0xc0 mm/kasan/generic.c:541 __call_rcu_common kernel/rcu/tree.c:3086 [inline] call_rcu+0x167/0xa70 kernel/rcu/tree.c:3190 kthread_worker_fn+0x502/0xb70 kernel/kthread.c:842 kthread+0x2f2/0x390 kernel/kthread.c:389 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 The buggy address belongs to the object at ffff88802417c800 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 296 bytes inside of freed 512-byte region [ffff88802417c800, ffff88802417ca00) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2417c head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff88801ac41c80 ffffea0001c6fb00 dead000000000002 raw: 0000000000000000 0000000000100010 00000001f5000000 0000000000000000 head: 00fff00000000040 ffff88801ac41c80 ffffea0001c6fb00 dead000000000002 head: 0000000000000000 0000000000100010 00000001f5000000 0000000000000000 head: 00fff00000000002 ffffea0000905f01 ffffffffffffffff 0000000000000000 head: 0000000000000004 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0x52820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 1117, tgid 1117 (kworker/u8:8), ts 72717729200, free_ts 72681242146 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1537 prep_new_page mm/page_alloc.c:1545 [inline] get_page_from_freelist+0x3045/0x3190 mm/page_alloc.c:3457 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4733 alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2265 alloc_slab_page+0x6a/0x120 mm/slub.c:2413 allocate_slab+0x5a/0x2f0 mm/slub.c:2579 new_slab mm/slub.c:2632 [inline] ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3819 __slab_alloc+0x58/0xa0 mm/slub.c:3909 __slab_alloc_node mm/slub.c:3962 [inline] slab_alloc_node mm/slub.c:4123 [inline] __do_kmalloc_node mm/slub.c:4264 [inline] __kmalloc_noprof+0x25a/0x400 mm/slub.c:4277 kmalloc_noprof include/linux/slab.h:882 [inline] kzalloc_noprof include/linux/slab.h:1014 [inline] fib6_info_alloc+0x2e/0xf0 net/ipv6/ip6_fib.c:155 ip6_route_info_create+0x445/0x12b0 net/ipv6/route.c:3761 ip6_route_add+0x28/0x160 net/ipv6/route.c:3853 addrconf_prefix_route net/ipv6/addrconf.c:2486 [inline] addrconf_add_linklocal+0x61a/0xa30 net/ipv6/addrconf.c:3319 addrconf_addr_gen+0x510/0xbb0 addrconf_dev_config net/ipv6/addrconf.c:3494 [inline] addrconf_init_auto_addrs+0x96a/0xeb0 net/ipv6/addrconf.c:3572 addrconf_notify+0xaff/0x1020 net/ipv6/addrconf.c:3745 page last free pid 25 tgid 25 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1108 [inline] free_unref_page+0xcfb/0xf20 mm/page_alloc.c:2638 __slab_free+0x31b/0x3d0 mm/slub.c:4491 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x9a/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:247 [inline] slab_post_alloc_hook mm/slub.c:4086 [inline] slab_alloc_node mm/slub.c:4135 [inline] __kmalloc_cache_noprof+0x132/0x2c0 mm/slub.c:4291 kmalloc_noprof include/linux/slab.h:878 [inline] kzalloc_noprof include/linux/slab.h:1014 [inline] nsim_fib4_rt_create drivers/net/netdevsim/fib.c:280 [inline] nsim_fib4_rt_insert drivers/net/netdevsim/fib.c:426 [inline] nsim_fib4_event drivers/net/netdevsim/fib.c:464 [inline] nsim_fib_event drivers/net/netdevsim/fib.c:884 [inline] nsim_fib_event_work+0xe1a/0x4130 drivers/net/netdevsim/fib.c:1492 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xa65/0x1850 kernel/workqueue.c:3310 worker_thread+0x870/0xd30 kernel/workqueue.c:3391 kthread+0x2f2/0x390 kernel/kthread.c:389 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Memory state around the buggy address: ffff88802417c800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88802417c880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88802417c900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88802417c980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88802417ca00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================