====================================== | [ 795.748754][ T68] ================================================================== | [ 795.749222][ T68] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:729) | [ 795.749661][ T68] Read of size 1 at addr ffff888005538bbc by task kworker/u8:1/68 | [ 795.750069][ T68] [ 795.750625][ T68] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 795.751308][ T68] Workqueue: netns cleanup_net [ 795.751566][ T68] Call Trace: [ 795.751745][ T68] [ 795.751901][ T68] dump_stack_lvl (lib/dump_stack.c:107) [ 795.752142][ T68] print_address_description.constprop.0 (mm/kasan/report.c:378) [ 795.752493][ T68] ? kobject_put (lib/kobject.c:729) [ 795.752737][ T68] print_report (mm/kasan/report.c:489) [ 795.752977][ T68] ? kasan_addr_to_slab (./arch/x86/include/asm/bitops.h:206 ./arch/x86/include/asm/bitops.h:238 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 ./include/linux/page-flags.h:481 mm/kasan/../slab.h:206 mm/kasan/common.c:38) [ 795.753279][ T68] kasan_report (mm/kasan/report.c:603) [ 795.753513][ T68] ? kobject_put (lib/kobject.c:729) [ 795.753754][ T68] kobject_put (lib/kobject.c:729) [ 795.753981][ T68] br_sysfs_delbr (net/bridge/br_sysfs_br.c:1086) bridge [ 795.754344][ T68] br_dev_delete (net/bridge/br_if.c:396) bridge [ 795.754669][ T68] br_net_exit_batch_rtnl (net/bridge/br.c:369) bridge [ 795.755057][ T68] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) [ 795.755300][ T68] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) [ 795.755599][ T68] ? __pfx_cleanup_net (net/core/net_namespace.c:581) [ 795.755867][ T68] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) [ 795.756118][ T68] ? process_one_work (kernel/workqueue.c:2609) [ 795.756393][ T68] process_one_work (kernel/workqueue.c:2638) [ 795.756662][ T68] ? hlock_class (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/locking/lockdep.c:228) [ 795.756906][ T68] ? __pfx_process_one_work (kernel/workqueue.c:2542) [ 795.757193][ T68] ? assign_work (kernel/workqueue.c:1101) [ 795.757439][ T68] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) [ 795.757692][ T68] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) [ 795.758046][ T68] ? __pfx_worker_thread (kernel/workqueue.c:2733) [ 795.758321][ T68] ? __pfx_worker_thread (kernel/workqueue.c:2733) [ 795.758591][ T68] kthread (kernel/kthread.c:388) [ 795.758838][ T68] ? __pfx_kthread (kernel/kthread.c:341) [ 795.759085][ T68] ret_from_fork (arch/x86/kernel/process.c:153) [ 795.759326][ T68] ? __pfx_kthread (kernel/kthread.c:341) [ 795.759569][ T68] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) | [ 795.779057][ T68] ------------[ cut here ]------------ | [ 795.779350][ T68] refcount_t: underflow; use-after-free. | [ 795.779678][ T68] WARNING: CPU: 2 PID: 68 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) | [ 795.780240][ T68] Modules linked in: macvlan vxlan ip6_udp_tunnel udp_tunnel act_pedit act_mirred bridge stp llc cls_matchall ip_gre act_gact cls_flower sch_ingress 8021q ip6_gre ip6_tunnel tunnel6 gre vrf veth [ 795.781880][ T68] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 795.782623][ T68] Workqueue: netns cleanup_net [ 795.782915][ T68] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) [ 795.783384][ T68] Code: 64 5d 03 80 fb 01 0f 87 54 5a 91 01 83 e3 01 0f 85 4d ff ff ff c6 05 d6 64 5d 03 01 90 48 c7 c7 00 58 82 a3 e8 5e 4c 2b ff 90 <0f> 0b 90 90 e9 2f ff ff ff 48 89 df e8 7c 23 a7 ff e9 b6 fe ff ff All code ======== 0: 64 5d fs pop %rbp 2: 03 80 fb 01 0f 87 add -0x78f0fe05(%rax),%eax 8: 54 push %rsp 9: 5a pop %rdx a: 91 xchg %eax,%ecx b: 01 83 e3 01 0f 85 add %eax,-0x7af0fe1d(%rbx) 11: 4d ff rex.WRB (bad) 13: ff (bad) 14: ff c6 inc %esi 16: 05 d6 64 5d 03 add $0x35d64d6,%eax 1b: 01 90 48 c7 c7 00 add %edx,0xc7c748(%rax) 21: 58 pop %rax 22: 82 (bad) 23: a3 e8 5e 4c 2b ff 90 movabs %eax,0xb0f90ff2b4c5ee8 2a:* 0f 0b <-- trapping instruction 2c: 90 nop 2d: 90 nop 2e: e9 2f ff ff ff jmp 0xffffffffffffff62 33: 48 89 df mov %rbx,%rdi 36: e8 7c 23 a7 ff call 0xffffffffffa723b7 3b: e9 b6 fe ff ff jmp 0xfffffffffffffef6 Code starting with the faulting instruction =========================================== 0: 0f 0b ud2 2: 90 nop 3: 90 nop 4: e9 2f ff ff ff jmp 0xffffffffffffff38 9: 48 89 df mov %rbx,%rdi c: e8 7c 23 a7 ff call 0xffffffffffa7238d 11: e9 b6 fe ff ff jmp 0xfffffffffffffecc [ 795.784464][ T68] RSP: 0018:ffffc900004efb98 EFLAGS: 00010282 [ 795.784793][ T68] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffffa0d0e74f [ 795.785237][ T68] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001 [ 795.785660][ T68] RBP: 0000000000000003 R08: 0000000000000000 R09: fffff5200009df18 [ 795.786095][ T68] R10: ffffc900004ef8c7 R11: 205d383654202020 R12: ffff88800a3e2000 [ 795.786513][ T68] R13: ffff88800a3e2dd8 R14: ffffc900004efc98 R15: ffff88800a3e2ba0 [ 795.786954][ T68] FS: 0000000000000000(0000) GS:ffff888035a00000(0000) knlGS:0000000000000000 [ 795.787432][ T68] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 795.787783][ T68] CR2: 00005563c3ecedec CR3: 000000000a12e004 CR4: 00000000001706f0 [ 795.788206][ T68] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 795.788623][ T68] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 795.789063][ T68] Call Trace: [ 795.789245][ T68] [ 795.789408][ T68] ? __warn (kernel/panic.c:677) [ 795.789632][ T68] ? refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) [ 795.789929][ T68] ? report_bug (lib/bug.c:201 lib/bug.c:219) [ 795.790183][ T68] ? vprintk_emit (kernel/printk/printk.c:2313) [ 795.790435][ T68] ? handle_bug (arch/x86/kernel/traps.c:238) [ 795.790666][ T68] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) [ 795.790948][ T68] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) [ 795.791233][ T68] ? desc_read (./arch/x86/include/asm/atomic64_64.h:20 ./include/linux/atomic/atomic-arch-fallback.h:2615 ./include/linux/atomic/atomic-long.h:79 ./include/linux/atomic/atomic-instrumented.h:3196 kernel/printk/printk_ringbuffer.c:534) [ 795.791476][ T68] ? refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) [ 795.791772][ T68] ? refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) [ 795.792074][ T68] br_sysfs_delbr (net/bridge/br_sysfs_br.c:1086) bridge [ 795.792400][ T68] br_dev_delete (net/bridge/br_if.c:396) bridge [ 795.792736][ T68] br_net_exit_batch_rtnl (net/bridge/br.c:369) bridge [ 795.793099][ T68] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) [ 795.793342][ T68] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) [ 795.793640][ T68] ? __pfx_cleanup_net (net/core/net_namespace.c:581) [ 795.793907][ T68] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) [ 795.794168][ T68] ? process_one_work (kernel/workqueue.c:2609) [ 795.794446][ T68] process_one_work (kernel/workqueue.c:2638) [ 795.794720][ T68] ? hlock_class (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/locking/lockdep.c:228) [ 795.794987][ T68] ? __pfx_process_one_work (kernel/workqueue.c:2542) [ 795.795279][ T68] ? assign_work (kernel/workqueue.c:1101) [ 795.795530][ T68] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) [ 795.795780][ T68] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) [ 795.796134][ T68] ? __pfx_worker_thread (kernel/workqueue.c:2733) [ 795.796408][ T68] ? __pfx_worker_thread (kernel/workqueue.c:2733) [ 795.796686][ T68] kthread (kernel/kthread.c:388) [ 795.796903][ T68] ? __pfx_kthread (kernel/kthread.c:341) [ 795.797155][ T68] ret_from_fork (arch/x86/kernel/process.c:153) [ 795.797395][ T68] ? __pfx_kthread (kernel/kthread.c:341) [ 795.797645][ T68] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) | [ 795.800822][ T68] ------------[ cut here ]------------ | [ 795.801172][ T68] sysfs group 'bridge' not found for kobject 'br1' | [ 795.801551][ T68] WARNING: CPU: 1 PID: 68 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) | [ 795.802049][ T68] Modules linked in: macvlan vxlan ip6_udp_tunnel udp_tunnel act_pedit act_mirred bridge stp llc cls_matchall ip_gre act_gact cls_flower sch_ingress 8021q ip6_gre ip6_tunnel tunnel6 gre vrf veth [ 795.803588][ T68] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 795.804242][ T68] Workqueue: netns cleanup_net [ 795.804501][ T68] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) [ 795.804818][ T68] Code: 89 d9 49 8b 14 24 48 b8 00 00 00 00 00 fc ff df 48 c1 e9 03 80 3c 01 00 75 45 48 8b 33 48 c7 c7 a0 99 7c a3 e8 10 18 5f ff 90 <0f> 0b 90 90 48 83 c4 08 5b 5d 41 5c c3 cc cc cc cc e8 69 ee da ff All code ======== 0: 89 d9 mov %ebx,%ecx 2: 49 8b 14 24 mov (%r12),%rdx 6: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax d: fc ff df 10: 48 c1 e9 03 shr $0x3,%rcx 14: 80 3c 01 00 cmpb $0x0,(%rcx,%rax,1) 18: 75 45 jne 0x5f 1a: 48 8b 33 mov (%rbx),%rsi 1d: 48 c7 c7 a0 99 7c a3 mov $0xffffffffa37c99a0,%rdi 24: e8 10 18 5f ff call 0xffffffffff5f1839 29: 90 nop 2a:* 0f 0b ud2 <-- trapping instruction 2c: 90 nop 2d: 90 nop 2e: 48 83 c4 08 add $0x8,%rsp 32: 5b pop %rbx 33: 5d pop %rbp 34: 41 5c pop %r12 36: c3 ret 37: cc int3 38: cc int3 39: cc int3 3a: cc int3 3b: e8 69 ee da ff call 0xffffffffffdaeea9 Code starting with the faulting instruction =========================================== 0: 0f 0b ud2 2: 90 nop 3: 90 nop 4: 48 83 c4 08 add $0x8,%rsp 8: 5b pop %rbx 9: 5d pop %rbp a: 41 5c pop %r12 c: c3 ret d: cc int3 e: cc int3 f: cc int3 10: cc int3 11: e8 69 ee da ff call 0xffffffffffdaee7f [ 795.805851][ T68] RSP: 0018:ffffc900004efba0 EFLAGS: 00010282 [ 795.806181][ T68] RAX: 0000000000000000 RBX: ffffffffc0734f00 RCX: ffffffffa0d0e74f [ 795.806601][ T68] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001 [ 795.807023][ T68] RBP: 0000000000000000 R08: 0000000000000000 R09: fffff5200009df19 [ 795.807446][ T68] R10: ffffc900004ef8cf R11: 205d383654202020 R12: ffff88800a3e2610 [ 795.807865][ T68] R13: ffff88800a3e2dd8 R14: ffffc900004efc98 R15: ffff88800a3e2ba0 [ 795.808290][ T68] FS: 0000000000000000(0000) GS:ffff888035600000(0000) knlGS:0000000000000000 [ 795.808762][ T68] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 795.809119][ T68] CR2: 00007f31901e1270 CR3: 0000000006828002 CR4: 00000000001706f0 [ 795.809545][ T68] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 795.809975][ T68] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 795.810405][ T68] Call Trace: [ 795.810590][ T68] [ 795.810751][ T68] ? __warn (kernel/panic.c:677) [ 795.810979][ T68] ? console_trylock (kernel/printk/printk.c:2659 kernel/printk/printk.c:2654) [ 795.811246][ T68] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) [ 795.811524][ T68] ? report_bug (lib/bug.c:201 lib/bug.c:219) [ 795.811769][ T68] ? handle_bug (arch/x86/kernel/traps.c:238) [ 795.812006][ T68] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) [ 795.812258][ T68] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) [ 795.812528][ T68] ? desc_read (./arch/x86/include/asm/atomic64_64.h:20 ./include/linux/atomic/atomic-arch-fallback.h:2615 ./include/linux/atomic/atomic-long.h:79 ./include/linux/atomic/atomic-instrumented.h:3196 kernel/printk/printk_ringbuffer.c:534) [ 795.812764][ T68] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) [ 795.813050][ T68] br_dev_delete (net/bridge/br_if.c:396) bridge [ 795.813381][ T68] br_net_exit_batch_rtnl (net/bridge/br.c:369) bridge [ 795.813741][ T68] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) [ 795.813989][ T68] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) [ 795.814290][ T68] ? __pfx_cleanup_net (net/core/net_namespace.c:581) [ 795.814556][ T68] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) [ 795.814805][ T68] ? process_one_work (kernel/workqueue.c:2609) [ 795.815085][ T68] process_one_work (kernel/workqueue.c:2638) [ 795.815355][ T68] ? hlock_class (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/locking/lockdep.c:228) [ 795.815597][ T68] ? __pfx_process_one_work (kernel/workqueue.c:2542) [ 795.815885][ T68] ? assign_work (kernel/workqueue.c:1101) [ 795.816141][ T68] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) [ 795.816399][ T68] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) [ 795.816751][ T68] ? __pfx_worker_thread (kernel/workqueue.c:2733) [ 795.817032][ T68] ? __pfx_worker_thread (kernel/workqueue.c:2733) [ 795.817306][ T68] kthread (kernel/kthread.c:388) [ 795.817524][ T68] ? __pfx_kthread (kernel/kthread.c:341) [ 795.817770][ T68] ret_from_fork (arch/x86/kernel/process.c:153) [ 795.818017][ T68] ? __pfx_kthread (kernel/kthread.c:341) Finger prints: dump_stack_lvl:print_report:kasan_report:kobject_put refcount_warn_saturate:br_sysfs_delbr:br_dev_delete:br_net_exit_batch_rtnl sysfs_remove_group:br_dev_delete:br_net_exit_batch_rtnl:cleanup_net