On Wed, Jul 15, 2026 at 05:22:44PM +0000, Korenblit, Miriam Rachel wrote: > > > > -----Original Message----- > > From: Marek Marczykowski-Górecki > > Sent: Wednesday, July 15, 2026 5:33 PM > > To: Korenblit, Miriam Rachel > > Cc: linux-wireless@vger.kernel.org; linux-kernel@vger.kernel.org > > Subject: kernel BUG at mm/slub.c:634 (kfree) when unbinding device from iwlwifi > > > > Hello, > > > > I get a kernel panic when unbinding device (8086:0085) from the iwlwifi driver > > (via writing to the "unbind" file in sysfs), while the wifi connection is active. I can > > reproduce it on Thinkpad X230, but other devices might be affected too. The > > specific crash is: > > > > [ 286.908182] kernel BUG at mm/slub.c:634! > > [ 286.908201] Oops: invalid opcode: 0000 [#1] SMP PTI > > [ 286.908221] CPU: 1 UID: 0 PID: 1959 Comm: prepare-suspend Not tainted > > 6.18.15-1.qubes.fc41.x86_64 #1 PREEMPT(full) > > [ 286.908255] Hardware name: Xen HVM domU, BIOS 4.19.4 03/17/2026 > > [ 286.908275] RIP: 0010:kfree+0x3a8/0x470 > > [ 286.908292] Code: 5d 41 5e 41 5f 5d e9 67 bb ff ff 4d 89 f1 41 b8 01 00 00 00 > > 48 89 d9 48 89 da 4c 89 ee 4c 89 e7 e8 ad 2c 00 00 e9 bd fd ff ff <0f> 0b 89 c8 4c > > 8d 04 03 40 f6 c6 80 0f 84 41 ff ff ff 83 e6 08 0f > > [ 286.908347] RSP: 0018:ffffcfce8280bb50 EFLAGS: 00010246 > > [ 286.908365] RAX: ffff8b2dcef2c800 RBX: ffff8b2dcef2c800 RCX: > > ffff8b2dcef2c830 > > [ 286.908389] RDX: 00000000000be001 RSI: 0000000000000000 RDI: > > ffff8b2dcef2c880 > > [ 286.908414] RBP: ffffcfce8280bba0 R08: ffff8b2dcef2c860 R09: > > 0000000000000000 > > [ 286.908438] R10: ffff8b2dcef2c860 R11: 0000000000000000 R12: > > ffff8b2dd2841600 > > [ 286.908462] R13: fffff077003bcb00 R14: ffffffffc093c480 R15: > > 0000000000000060 > > [ 286.908487] FS: 00007b10286cd740(0000) GS:ffff8b2e19c6c000(0000) > > knlGS:0000000000000000 > > [ 286.908511] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > > [ 286.908532] CR2: 00007fb93027bc70 CR3: 00000000034f0005 CR4: > > 00000000001706f0 > > [ 286.908559] Call Trace: > > [ 286.908570] > > [ 286.908581] ? _raw_spin_unlock_bh+0xe/0x20 > > [ 286.908599] iwl_pcie_txq_free+0x130/0x170 [iwlwifi] > > [ 286.908644] iwl_pcie_tx_free+0x66/0xe0 [iwlwifi] > > [ 286.908681] iwl_trans_pcie_free+0x1df/0x250 [iwlwifi] > > [ 286.908719] pci_device_remove+0x42/0xb0 > > [ 286.908736] device_release_driver_internal+0x19c/0x200 > > [ 286.908755] unbind_store+0xa1/0xb0 > > [ 286.908771] kernfs_fop_write_iter+0x150/0x200 > > [ 286.908790] vfs_write+0x25d/0x450 > > [ 286.908806] ksys_write+0x6b/0xe0 > > [ 286.908825] do_syscall_64+0x84/0x800 > > [ 286.908842] ? syscall_exit_work+0x108/0x140 > > [ 286.908861] ? do_syscall_64+0xbb/0x800 > > [ 286.908876] ? ksys_dup3+0x63/0xf0 > > [ 286.908892] ? syscall_exit_work+0x108/0x140 > > [ 286.911388] ? do_syscall_64+0xbb/0x800 > > [ 286.911408] ? do_sys_openat2+0xa4/0xe0 > > [ 286.911423] ? syscall_exit_work+0x108/0x140 > > [ 286.911443] ? do_syscall_64+0xbb/0x800 > > [ 286.911458] entry_SYSCALL_64_after_hwframe+0x76/0x7e > > [ 286.911477] RIP: 0033:0x7b102873ec5e > > [ 286.911493] Code: 4d 89 d8 e8 34 bd 00 00 4c 8b 5d f8 41 8b 93 08 03 00 00 > > 59 5e 48 83 f8 fc 74 11 c9 c3 0f 1f 80 00 00 00 00 48 8b 45 10 0f 05 c3 83 e2 > > 39 83 fa 08 75 e7 e8 13 ff ff ff 0f 1f 00 f3 0f 1e fa > > [ 286.911549] RSP: 002b:00007ffd94bc3100 EFLAGS: 00000202 ORIG_RAX: > > 0000000000000001 > > [ 286.911575] RAX: ffffffffffffffda RBX: 00007b10288ba5c0 RCX: > > 00007b102873ec5e > > [ 286.911600] RDX: 000000000000000d RSI: 00006385db4f8020 RDI: > > 0000000000000001 > > [ 286.911625] RBP: 00007ffd94bc3110 R08: 0000000000000000 R09: > > 0000000000000000 > > [ 286.911650] R10: 0000000000000000 R11: 0000000000000202 R12: > > 000000000000000d > > [ 286.911674] R13: 000000000000000d R14: 00006385db4f8020 R15: > > 00006385db4f5b30 > > [ 286.911701] > > [ 286.911711] Modules linked in: iwldvm iwlwifi mac80211 ehci_pci ehci_hcd > > nft_nat nft_flow_offload nf_flow_table_inet nf_flow_table qrtr > > nf_conntrack_netlink nft_reject_ipv6 nf_reject_ipv6 nft_reject_ipv4 > > nf_reject_ipv4 nft_reject nft_ct nft_masq nft_chain_nat nf_nat nf_conntrack > > nf_defrag_ipv6 nf_defrag_ipv4 nf_tables joydev libarc4 intel_rapl_msr > > intel_rapl_common polyval_clmulni ghash_clmulni_intel cfg80211 e1000e > > ata_generic rfkill i2c_piix4 pata_acpi i2c_smbus pcspkr floppy vfat fat serio_raw > > xen_scsiback target_core_mod xen_netback xen_privcmd xen_gntdev > > xen_gntalloc xen_blkback xen_evtchn i2c_dev fuse loop nfnetlink overlay > > xen_blkfront [last unloaded: iwlwifi] > > [ 286.911967] ---[ end trace 0000000000000000 ]--- > > > > This is running in a VM (HVM) under Xen, with relevant PCI device attached, but I > > don't think it's relevant for this bug. > > > > I've got reports about the issue in Linux 6.18.15 initially (after updating from > > 6.12), but later tests identified it's a regression somewhere between 6.15.11 and > > 6.16.8. > > Hi, could you please test the attached patch? > It is based on 6.18 Yes, the patch fixes it! Tested-by: Marek Marczykowski-Górecki -- Best Regards, Marek Marczykowski-Górecki Invisible Things Lab