bridge0: port 2(bridge_slave_1) entered disabled state device bridge_slave_0 left promiscuous mode bridge0: port 1(bridge_slave_0) entered disabled state device veth0_vlan left promiscuous mode ================================================================== BUG: KASAN: null-ptr-deref in instrument_atomic_read include/linux/instrumented.h:71 [inline] BUG: KASAN: null-ptr-deref in atomic_read include/asm-generic/atomic-instrumented.h:27 [inline] BUG: KASAN: null-ptr-deref in __tcf_idr_release net/sched/act_api.c:162 [inline] BUG: KASAN: null-ptr-deref in tcf_idrinfo_destroy+0xbf/0x220 net/sched/act_api.c:589 Read of size 4 at addr 0000000000000010 by task kworker/u4:2/112 CPU: 1 PID: 112 Comm: kworker/u4:2 Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Workqueue: netns cleanup_net Call Trace: __dump_stack+0x21/0x24 lib/dump_stack.c:77 dump_stack_lvl+0x1a7/0x208 lib/dump_stack.c:118 __kasan_report mm/kasan/report.c:439 [inline] kasan_report+0xd8/0x130 mm/kasan/report.c:452 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x249/0x2a0 mm/kasan/generic.c:189 __kasan_check_read+0x11/0x20 mm/kasan/shadow.c:31 instrument_atomic_read include/linux/instrumented.h:71 [inline] atomic_read include/asm-generic/atomic-instrumented.h:27 [inline] __tcf_idr_release net/sched/act_api.c:162 [inline] tcf_idrinfo_destroy+0xbf/0x220 net/sched/act_api.c:589 tc_action_net_exit include/net/act_api.h:151 [inline] gact_exit_net+0xe3/0x150 net/sched/act_gact.c:278 ops_exit_list net/core/net_namespace.c:190 [inline] cleanup_net+0x603/0xb80 net/core/net_namespace.c:609 process_one_work+0x6e1/0xba0 kernel/workqueue.c:2301 worker_thread+0xa6a/0x13c0 kernel/workqueue.c:2447 kthread+0x346/0x3d0 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 ================================================================== general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017] CPU: 1 PID: 112 Comm: kworker/u4:2 Tainted: G B W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Workqueue: netns cleanup_net RIP: 0010:arch_atomic_read arch/x86/include/asm/atomic.h:29 [inline] RIP: 0010:atomic_read include/asm-generic/atomic-instrumented.h:28 [inline] RIP: 0010:__tcf_idr_release net/sched/act_api.c:162 [inline] RIP: 0010:tcf_idrinfo_destroy+0xc6/0x220 net/sched/act_api.c:589 Code: 40 e8 be 05 a5 fe 48 85 c0 0f 84 1a 01 00 00 49 89 c4 4c 8d 68 20 4c 89 ef be 04 00 00 00 e8 81 3c ea fd 4c 89 e8 48 c1 e8 03 <42> 0f b6 04 38 84 c0 0f 85 ba 00 00 00 45 8b 6d 00 31 ff 44 89 ee RSP: 0018:ffffc90000bc7b60 EFLAGS: 00010202 RAX: 0000000000000002 RBX: ffff8881067918b0 RCX: 0000000000000286 RDX: 0000000000000000 RSI: 0000000000000002 RDI: 00000000ffffffff RBP: ffffc90000bc7c08 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffffbfff0dcf448 R12: fffffffffffffff0 R13: 0000000000000010 R14: ffffffff86af61f0 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fff93813c9c CR3: 000000000640f000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: tc_action_net_exit include/net/act_api.h:151 [inline] gact_exit_net+0xe3/0x150 net/sched/act_gact.c:278 ops_exit_list net/core/net_namespace.c:190 [inline] cleanup_net+0x603/0xb80 net/core/net_namespace.c:609 process_one_work+0x6e1/0xba0 kernel/workqueue.c:2301 worker_thread+0xa6a/0x13c0 kernel/workqueue.c:2447 kthread+0x346/0x3d0 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 Modules linked in: ---[ end trace 250567784218de08 ]--- RIP: 0010:arch_atomic_read arch/x86/include/asm/atomic.h:29 [inline] RIP: 0010:atomic_read include/asm-generic/atomic-instrumented.h:28 [inline] RIP: 0010:__tcf_idr_release net/sched/act_api.c:162 [inline] RIP: 0010:tcf_idrinfo_destroy+0xc6/0x220 net/sched/act_api.c:589 Code: 40 e8 be 05 a5 fe 48 85 c0 0f 84 1a 01 00 00 49 89 c4 4c 8d 68 20 4c 89 ef be 04 00 00 00 e8 81 3c ea fd 4c 89 e8 48 c1 e8 03 <42> 0f b6 04 38 84 c0 0f 85 ba 00 00 00 45 8b 6d 00 31 ff 44 89 ee RSP: 0018:ffffc90000bc7b60 EFLAGS: 00010202 RAX: 0000000000000002 RBX: ffff8881067918b0 RCX: 0000000000000286 RDX: 0000000000000000 RSI: 0000000000000002 RDI: 00000000ffffffff RBP: ffffc90000bc7c08 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffffbfff0dcf448 R12: fffffffffffffff0 R13: 0000000000000010 R14: ffffffff86af61f0 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f791177eaa8 CR3: 000000010d5a3000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 40 e8 be 05 a5 fe rex call 0xfea505c4 6: 48 85 c0 test %rax,%rax 9: 0f 84 1a 01 00 00 je 0x129 f: 49 89 c4 mov %rax,%r12 12: 4c 8d 68 20 lea 0x20(%rax),%r13 16: 4c 89 ef mov %r13,%rdi 19: be 04 00 00 00 mov $0x4,%esi 1e: e8 81 3c ea fd call 0xfdea3ca4 23: 4c 89 e8 mov %r13,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 0f b6 04 38 movzbl (%rax,%r15,1),%eax <-- trapping instruction 2f: 84 c0 test %al,%al 31: 0f 85 ba 00 00 00 jne 0xf1 37: 45 8b 6d 00 mov 0x0(%r13),%r13d 3b: 31 ff xor %edi,%edi 3d: 44 89 ee mov %r13d,%esi