Hello, syzbot found the following issue on: HEAD commit: 3a2cb45ca0cc net: mlxsw: i2c: Switch back to use struct i2.. git tree: net-next console output: https://syzkaller.appspot.com/x/log.txt?x=158b6207280000 kernel config: https://syzkaller.appspot.com/x/.config?x=526f919910d4a671 dashboard link: https://syzkaller.appspot.com/bug?extid=f9b37508c6a44a2b72b6 compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/5fa469ebaab3/disk-3a2cb45c.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/e92fd67e9282/vmlinux-3a2cb45c.xz kernel image: https://storage.googleapis.com/syzbot-assets/5201fed94bfc/bzImage-3a2cb45c.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+f9b37508c6a44a2b72b6@xxxxxxxxxxxxxxxxxxxxxxxxx ================================================================== BUG: KASAN: null-ptr-deref in instrument_atomic_read include/linux/instrumented.h:68 [inline] BUG: KASAN: null-ptr-deref in _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline] BUG: KASAN: null-ptr-deref in netif_running include/linux/netdevice.h:3619 [inline] BUG: KASAN: null-ptr-deref in nsim_dev_trap_report_work+0x117/0xc80 drivers/net/netdevsim/dev.c:850 Read of size 8 at addr 0000000000000038 by task kworker/1:2/29478 CPU: 1 PID: 29478 Comm: kworker/1:2 Not tainted 6.4.0-rc5-syzkaller-01182-g3a2cb45ca0cc #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023 Workqueue: events nsim_dev_trap_report_work Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106 print_report mm/kasan/report.c:465 [inline] kasan_report+0xec/0x130 mm/kasan/report.c:572 check_region_inline mm/kasan/generic.c:181 [inline] kasan_check_range+0x141/0x190 mm/kasan/generic.c:187 instrument_atomic_read include/linux/instrumented.h:68 [inline] _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline] netif_running include/linux/netdevice.h:3619 [inline] nsim_dev_trap_report_work+0x117/0xc80 drivers/net/netdevsim/dev.c:850 process_one_work+0x99a/0x15e0 kernel/workqueue.c:2405 worker_thread+0x67d/0x10c0 kernel/workqueue.c:2552 kthread+0x344/0x440 kernel/kthread.c:379 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 </TASK> ================================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the bug is already fixed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to change bug's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the bug is a duplicate of another bug, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
